Book summary “Handmade”: summary

Introduction

You live in a world built from complex substances, yet you rarely touch the raw materials shaping your daily life. Modern manufacturing hides the origins of everyday objects, leaving you disconnected from the physical reality of the things you use. You might wonder how raw elements transform into durable goods, yet find materials science locked behind academic jargon.

You can understand the physical world and find human connection by working directly with core materials like glass, stone, plastics, metals, clay, sugar, wool, wood, and paper.

Anna Ploszajski takes you on a hands-on journey across multiple length scales to demystify the stuff surrounding you. You will explore how physical making changes your perspective on modern consumerism and production. The book guides you through the properties and processing techniques of nine distinct substances.

You will discover answers to questions such as:

• How do internal atomic structures dictate the strength of glass and metal?
• What physical transformations occur when you fire clay or melt sugar?
• How do biological composites like wood and wool provide structural integrity?

1. Glass and Stone

Materials science studies substances by examining them across multiple length scales, from human-observable textures down to atomic microstructures and quantum sub-atomic levels. The human scale covers objects you can hold and feel. Zooming in reveals microstructures like grains and atomic arrangements that dictate properties such as rigidity. Sub-atomic levels involve protons, neutrons, and electrons governed by quantum physics, including 14 electrons for silicon and 8 electrons for oxygen.

Glass and stone exhibit complex internal structures that dictate how they handle extreme temperatures, mechanical stresses, and weathering.

Glass Structure and Properties

Glass is defined by its amorphous molecular network of silicon dioxide, lacking the regimented crystal structures found in ice or metals. Silica molecules form a chaotic, randomly arranged network with strong covalent bonds. Additives like soda and lime can be placed in the gaps to modify properties such as the melting flow. Archaeological examples date back 5,000 years to northern Syria, Mesopotamia, and Egypt, while glass blowing into intricate forms was popularised by the Romans in the 1st century BC.

Charlie Murphy demonstrates cutting borosilicate glass rods known as Pyrex using a tungsten carbide razor blade.

Borosilicate glass resists thermal shock because its molecular network incorporates boron trioxide, which prevents excessive expansion when heated. Traditional soda lime glass expands unevenly and cracks under rapid heating because its atomic bonds stretch. Borosilicate glass avoids this because its amorphous gaps accommodate bond lengthening and its strong bonds tightly hold atoms. German glassmaker Otto Schott invented borosilicate glass in the late 19th century.

Unlike crystalline solids that melt at a precise temperature, glass exhibits a glass transition where it gradually softens into a viscous liquid over a range of temperatures. Solid glass has a disordered molecular jumble without regular crystal lattices. When heated, molecules gain energy until the material slowly loses viscosity, allowing you to pull, stretch, and blow it. Terry and Ray operate a green vintage lathe to attach tubes to cones using torches and carbon pads.

Glass is transparent because its atomic energy levels are so widely spaced that visible light lacks the exact energy needed to excite electrons into higher orbits. Light waves pass unimpeded through the amorphous network because there are no crystal boundaries to scatter them, and visible light photons cannot cause electron jumps. Charlie Murphy uses didymium glasses made from praseodymium and neodymium to block yellowish glare from roaring flames.

Toughened glass achieves high impact resistance by rapidly cooling its outer layer so that it remains under constant molecular compression. Compression in the outer layer forces potential cracks to close up, though a heavy strike can overcome this compression and shatter the glass into blunt chunks. Ray shows polarised lenses in their workshop that reveal colorful ribbons and stripes indicating internal strains in glassware before annealing. Antonio Neri published L’Arte Vetraria in 1612, and Alastair Pilkington invented the float glass process in 1959.

Stone Mechanics and Conservation

Limestone is a sedimentary rock formed from compressed marine sediments over hundreds of millions of years. Bath Stone and other limestones originated 200 million years ago during the Jurassic period when Britain was under a shallow sea, accumulating spherical grains coated with lime along with creature shells and bones. Robert Hooke inspected a giant ammonite in a Portland quarry, which helped inspire his early theories on extinction and evolution.

Unlike most substances, water expands when it freezes due to molecular hydrogen bonding, which creates destructive pressure inside stone structures. Polar water molecules are held further apart in ice crystals by hydrogen bonds compared to liquid water, causing volume expansion that exerts immense stress on porous surrounding stone. Freezing rainwater trapped in stone structures causes weathering, cracking, and erosion over multiple winters.

Internal metal reinforcements can destroy stone structures over time as they rust and expand. When iron rods used for reinforcement oxidize, the resulting expansion exerts forces powerful enough to rupture brittle stone components and split monuments apart. Victorian cast-iron rods inside the tip of the Castle Combe market cross spire rusted and expanded, splitting the stone into pieces.

The directional layers in sedimentary stone dictate its structural strength and determine how you must orient them during construction. Limestone has a grain-like layer structure. Naturally bedded stone is laid horizontally so compression forces squash the layers together, whereas edge bedded stone has vertical layers that weather and delaminate over time. Stonemason Sam demonstrated how gravestones and church walls weather differently based on whether their sedimentary layers are oriented horizontally or vertically.

Lime mortar acts as a permeable, self-healing binding material that accommodates stone movement better than modern cement. Lime mortar sets via a hydration reaction and can self-heal when moisture and carbon dioxide react with exposed material to grow new calcium carbonate crystals inside cracks. Ancient Egyptians used lime mortar 4,500 years ago to plaster the pyramids of Giza. Andrew's team repaired monuments using lime mortar, noting that areas previously patched with rigid cement suffered severe ice damage because water pooled against the impermeable surface.

Sarsen stone is an extremely hard, silicified sandstone whose dense formation makes it notoriously difficult to carve. Sarsen was formed 55 million years ago when deposited sand layers were cemented together by groundwater containing dissolved silica as oceans receded, creating a material tough enough to break metal machinery. Andrew demonstrated the extreme hardness of sarsen stone by striking it with a quarrying punch, producing loud metallic clangs and sparks with almost no material removal.

Brittle materials like flint fracture in predictable, glass-like patterns when struck, enabling precise toolmaking. Striking flint sends a shockwave called a cone of percussion through the material, leaving behind shell-like surfaces with concentric ripple lines, dating back to the oldest stone tools excavated in Kenya 3.3 million years ago. Archaeologist Karl Lee demonstrated lithic reduction at the Institute of Making, rhythmically chipping a flint lump to produce a sharp, teardrop-shaped spearhead. You can try this yourself:

• Support a chunk of flint in your left hand with a protruding corner overhanging your fingertips by about an inch.
• Hit this corner with a smooth working-tool to fracture a small, flat piece off the bottom into your hand.

2. Plastics and Metals

Synthetic polymers and metallic alloys derive their strength from atomic arrangements, dislocation movements, and thermal processing techniques.

Polymer Chemistry and Waste

Plastics consist of long-chain polymer molecules formed when small monomer units join repeatedly, determining the material's physical properties. In the early 1920s, German chemistry professor Hermann Staudinger recognized that polymers are long chains of atoms, coining the term polymerisation for how monomers join like interlinked paperclips. Bakelite, patented in 1910, marked the beginning of modern synthetic plastics by offering a hard, heat- and electricity-resistant material made from synthetic chemicals. Invented by Belgian-born chemist Leo Baekeland in New York, Bakelite established a precedent for synthetic materials. Leo Baekeland was granted the patent for Bakelite in October 1910, just a few months before the author's grandfather George was born.

Thermoplastics and thermosets behave differently under heat due to their molecular bonding, directly impacting their potential for recycling. Thermoplastics have weak bonds between molecules that break and reform when heated and cooled, allowing them to be repeatedly melted and recycled. Thermosets undergo a one-way chemical reaction during curing, forming irreversible strong chemical bonds that render them unrecyclable by heat. Disruptions in natural material supplies during World War II drove research into alternatives like nylon, polyethylene, and polystyrene. Capitalising on this trend, George and his colleague Romek Michalkiewicz founded Stewart Plastics Ltd to manufacture household goods like soapboxes and combs. George and Romek employed a foreman named Harry Stewart for a few weeks to learn about plastics, eventually naming their successful Croydon-based company Stewart Plastics Ltd to avoid using the unwieldy name Michalkiewicz-Płoszajski Plastics.

High-density polyethylene combines linear molecules forming organized crystals with amorphous regions, making it durable yet vulnerable to a disposable economy. HDPE features linear, simple molecules that pack tightly into crystalline regions interspersed with chaotic amorphous regions. This gives it high strength and chemical resistance alongside flexibility, leading to its ubiquitous use in packaging like milk bottles and its current overabundance as waste. Designer James Shaw uses tons of free, discarded HDPE waste from recycling companies—often contaminated by green and blue pigments from milk bottle tops—to hand-extrude functional furniture and aesthetic objects. While glass and metals can be melted and reformed indefinitely without molecular degradation, recycling plastics and paper damages and shortens their polymer chains or fibres.

Metallurgy and Blacksmithing

Steel is an alloy made mostly of iron combined with a small amount of carbon, typically two percent or less, arranged in an orderly crystal lattice. Iron atoms form an orderly three-dimensional crystal lattice, and smaller carbon atoms squeeze into the gaps between the iron atoms, putting the crystal structure under stress. This stress makes it harder for atomic defects called dislocations to move, which increases the material's strength and hardness. The speed and temperature of an impact determine whether steel undergoes a ductile fracture or a brittle fracture. If steel breaks slowly, it experiences a ductile fracture where the material stretches, deforms, and tears, leaving a rough, dull surface.

Shaping metals through cold-working increases their hardness by tangling dislocations at grain boundaries, while annealing restores their malleability.

Hammering and bending metal at room temperature forces dislocations to multiply and jam against chaotic grain boundaries, making the material stiffer but brittle and prone to cracking. Heating the metal in a process called annealing allows atoms to relax, dissolving dislocations and forming new unstrained crystals. Andy Taylor's team must anneal brass discs three or four times throughout the bell-shaping process to prevent the metal from fracturing. Blacksmiths assess steel temperature by its color, which changes due to incandescence as atoms vibrate and emit visible light. As steel is heated in a forge, vibrating atoms release electromagnetic radiation.

The author made a fire poker at Agnes Jones's studio in Glasgow, cutting a steel bar with an angle grinder, heating it in a gas forge, and shaping it on an anvil with a hammer. You can follow these steps:

• Light the gas forge connected to a propane canister and place the steel bar in the flame.
• Monitor the steel color to gauge temperature: red to orange at 1000°C, and yellow to white at 1300°C.
• Remove the hot steel using a leather glove and place it flat on the anvil.
• Strike the glowing bar with a hammer, hitting from the elbow or shoulder rather than the wrist.
• Plunge the opposite end of the bar into a bucket of water to cool it to a safe handling temperature around 100°C.
• Reheat the bar to shape a curve using dogs in a clamp or create a twist using a vice and lever.

3. Clay and Sugar

Ceramics and carbohydrates combine microscopic plate structures and polar molecular bonding with extreme physical transformations during firing and endurance exertion.

Clay naturally contains up to 40 percent water which gravitates to the surface over time. You must wedge the material to eliminate air bubbles and create a uniform consistency.

Follow these steps:

• Cut a large block of clay in two with a nylon wire.
• Pick up one half and slap it on top of the other.
• Lift the pair, flip them over, and slam them down onto the benchtop to push out air bubbles.
• Repeat the slice, slap, and bang process to thoroughly mix the layers.

Doing this twenty times produces over a million layers. Clay gets its plasticity from its microscopic flat, plate-like atomic structure. These hexagonal plates are about half a micrometre across, meaning 200 plates fit side-by-side across the thickness of a book page and 20,000 plates fit side-by-side across a Kindle screen. Water molecules trapped between these particles act as a lubricant, allowing the sheets to slide over one another when you reshape the material. Without sufficient ageing or moisture, clay is described as short and cracks easily.

The story of the china cup began in China 2,000 years ago. European demand led alchemists like Johann Friedrich Böttger and Ehrenfried Walther von Tschirnhaus to discover hard-paste porcelain at Meissen in 1708. Thomas Frye at the Bow Porcelain Factory in Essex utilized a large supply of bone ash from local cattle markets and slaughterhouses to patent bone china in 1748. Nicolas-Christiern de Thy published L'art de la Porcelaine in 1771. Kilns at Jingdezhen could fire up to 25,000 objects at once.

Inside a kiln, trapped water is driven off above 120°C. The ceramic change happens at 350 to 700°C. Silica inversions occur at 220-280°C and 573°C, causing molecules to increase in length by 3 picometres and the piece to swell by 2 to 3 percent. Sintering occurs as atoms form bridges between neighbouring particles. Progressive vitrification fills pores with glass and forms needle-shaped mullite crystals above 1,000°C. Glazes comprise silica as a glass-former, alkaline oxide fluxes like sodium or potassium, and alumina as a stabiliser. The author applied layers of glazes named Muddy Waters and Hunter Green to her handmade mugs, observing how Muddy Waters transformed into a glossy mottled green-and-brown glass layer during firing.

Ceramics have low toughness and break easily under impact. The author's NASA mug left in the office kitchen was broken when its handle snapped clean off due to this low impact toughness. NASA used silica fibre thermal protection tiles on the underbelly of the Space Shuttle Atlantis to keep the underlying aluminium shell below 175°C during atmospheric re-entry. These high-purity amorphous silica fibres contain immense molecular imperfections, pores, and boundaries. These structural defects intercept and scatter both phonons and photons, preventing energy transfer against re-entry temperatures up to 1,260°C.

Sugar Chemistry and Endurance

Sugarcane crystallisation was invented in India 2,000 years ago. Europeans developed a massive sweet tooth for sugar in the 15th century. Christopher Columbus took sugarcane to the Americas in 1493. The transatlantic slave industry forcibly removed 12 million Africans from their homes, and 10 million enslaved people survived the journey. Small-scale farmers and plantation workers in developing countries currently account for 80 percent of the world's sugar. Ellie Doney showed the author dried sugarcane and dark, viscous molasses, illustrating the historical path from plant to refined sugarloaf.

Ellie Doney showed the author a gem-like single crystal of sugar with perfectly flat facets and a transparent interior. Jet engine blades spin inside an engine compressor at 1000 miles per hour. Ellie Doney performed the sugar snake experiment with the author, demonstrating how a 4:1 ratio of table sugar and bicarbonate of soda transforms into a gnarly, animalistic black foam. Water molecules have a V-shape making them polar, and maltodextrin is also highly polar and hydrophilic, enabling it to dissolve rapidly in water. During her 17 degrees Celsius English Channel swim, the author consumed warm squash mixed with maltodextrin powder every hour to fuel her muscles.

Chocolate combines cocoa solids, sugar, and fatty cocoa butter. Cocoa butter is hydrophobic, allowing items coated in chocolate to survive floating in the sea. The author relied on chocolate Mini Rolls during her swim training in Dover harbour and her Channel attempt, noting how the chocolate coating protected the inner sponge from brine. Scientists found in 2011 that mouse tongues have sweet receptors triggered by sodium. During her Channel swim night, the author found profound psychological and physical comfort in eating slices of Battenberg cake handed to her by her crew. Ellie Doney presented a collection of sugar substitutes and allowed the author to taste test alternatives like xylitol, sucralose, mannitol, and liquid glucose.

Cold water swimming burns up to 900 calories an hour. Once the starter store of 2000 calories provided by the liver and muscles is exhausted, the body shifts to burning fat. During her swim across Lake Windermere years prior, the author suffered a severe lack of energy from poor refuelling, leading to hallucinations of penguins and shouting obscenities at a pleasure boat. Jelly Babies consist of a hardened exterior shell and a soft interior made possible by gelatine sourced from collagen. In the morning hours of her Channel swim, the author relied on Jelly Babies handed to her by her crew to maintain her motivation and coat her mouth against the salt. When the author struggled against a spring tide near Cap Gris Nez during her 15 hours and 37 minutes successful English Channel swim, her crew members Sally, Ash, and Mike kept her going by managing feeds, offering encouragement, and sharing a honey sandwich.

4. Wool, Wood, and Paper

Biological composite materials like wool, wood, and paper feature sophisticated hierarchical structures that provide structural integrity, tactile comfort, and historical permanence.

Wool is a biological material of unmatched complexity, combining elasticity, strength, breathability, and water resistance in a hierarchical structure that modern synthetic fibres cannot replicate. At the molecular level, wool consists of keratin proteins forming spring-like coils called microfibrils, which are bundled within a continuous protein matrix surrounded by hydrophobic fatty layers and overlapping exterior scales. The author contrasts the advanced hierarchical structure of wool with simpler polymers like nylon and acrylic, noting that biology achieves far greater structural sophistication than synthetic engineering.

Human selective breeding over thousands of years has dramatically transformed native sheep fleeces, a practice pioneered by agriculturalist Robert Bakewell in the eighteenth century. Robert Bakewell revolutionized sheep breeding by separating males and females to control mating rather than letting flocks breed randomly, a methodology cited by Charles Darwin in On the Origin of Species. Sheep were first domesticated around 12,000 years ago in Mesopotamia, while woolly sheep arrived in Europe roughly 6,000 years ago, initiating 8,000 years of selective breeding to refine wool.

Superwashing uses an acid bath to remove the outer scales of wool fibres, preventing shrinkage caused by felting during machine washing. By stripping away the directional exterior scales that normally cause fibres to lock and tangle under physical agitation, superwashed wool acquires a smooth surface similar to synthetic fibres. This chemical treatment was developed in the 1970s to rescue the wool industry after a 40% price crash caused by the post-war rise of synthetic plastics.

Wool Processing and Dyeing

Acid dyeing permanently fixes color onto wool fibres through chemical bonding between negatively charged dye ions and positively charged protein sites induced by citric acid. Pre-soaking wool in an acidic bath creates positively charged sites on the wool proteins. When dissolved dyes split into ions, the negatively charged ions are strongly attracted to these sites and form chemical bonds accelerated by heating. At the London Loom studio, the author participates in a wool-dyeing workshop led by Helen Reed from The Wool Kitchen, practicing on pre-knitted sock blanks and skeins.

• Draw a landscape line across the top of a blank A4 paper to plan your color design on a sock blank
• Soak the pre-knitted sock blanks in a bath of plain water and citric acid
• Squeeze out excess water and flatten the blanks out on clingfilm
• Apply diluted liquid dye solutions using sponges, smudging adjacent stripes for blending
• Roll the dyed sock blanks into a sausage together with the underlying clingfilm
• Place the sausages into kitchen steamers and heat to 85 degrees Celsius for dye striking

Publicly engaging in hand-crafts like knitting breaks social conventions of silence in urban environments, fostering spontaneous connections with strangers. The author discovers that taking out her knitting on trains, in waiting rooms, or at concerts prompts strangers to initiate conversations about craft projects and personal memories. After completing 49 squares sourced from her road trip across Britain, the author sews them together into a patchwork blanket representing her travels.

Woodworking and Conservation

Working with greenwood using simple hand tools allows beginners to experience direct material connection and slow down away from industrial mechanisation. Greenwood retains around 50 percent natural moisture, making it soft enough to carve with basic hand tools like carving knives, crooked knives, and small hand axes. The author attended a day carving class at Stepney City Farm with Barn the Spoon, making three imperfect wooden spoons from birch wood sourced from Epping Forest.

• Carve the handle by holding the spoon-blank with the left hand across the body and pushing the wood-carving knife away at a shallow angle to strip long shavings.
• Transform the handle cross-section from a rough rectangle to an octagon, and then round it into a circle.
• Shape the neck by cupping the spoon head in the left hand, balancing the handle end against the chest, and slicing the neck side towards the body.
• Shape the back of the bowl using the chest lever grip by holding the spoon and knife at chest-height and pushing the chest out to carve against the grain.
• Hollow out the bowl using a question-mark-shaped knife by rotating the spoon head on a wooden block and cutting across the grain.

Wood is a natural composite material whose unique mechanical properties arise from cellulose carbon fibres embedded in a lignin matrix. Like carbon fibre-reinforced plastic, wood consists of long cellulose and hemicellulose molecules derived from sugars produced during photosynthesis. These chains provide high tensile strength, while lignin acts as a glue-like plastic matrix strong in compression.

Tree-rings serve as a precise historical barcode that records both archaeological ages and long-term climate cycles. Dendrochronology studies tree-rings to build exhaustive historical timelines covering a span of up to 10,000 years in records like the International Tree-Ring Data Bank. Because ring spacing depends on annual rainfall influenced by solar energy, tree-rings record meteorological cycles, droughts, volcanic impacts, and sunspot trends.

Waterlogged wooden artifacts from historical shipwrecks can be preserved by replacing trapped water with polyethylene glycol and freeze-drying. Waterlogged wood retains water inside its cells via capillary forces, and normal drying causes cells to collapse and crack due to uneven shrinkage stresses. The Tudor warship Mary Rose, which sank in 1545 in the Solent and was raised in 1982, yielded over 19,000 artifacts and a complete hull preserved through polyethylene glycol spraying and computer-monitored airflow drying before the spraying jets were switched off in 2013.

Prehistoric humans possessed an intimate understanding of the mechanical properties of different tree species for specialized toolmaking. Natural preservation under ice allows researchers to analyze ancient composite tools, showing how prehistoric people matched specific woods to functional requirements based on flexibility, tensile strength, and hardness. Ötzi the Iceman, found in the Alps in 1991 and preserved for over 5,000 years, carried a yew-handled copper axe, an ash-handled flint dagger, a yew bow, viburnum and dogwood arrows, birch-bark cylindrical pots, and a hazel wood backpack.

Paper Craft and Industrial History

Ancient Egyptians manufactured writing material by layering and pressing stripped papyrus reed inner parts, utilizing plant sap as a natural glue and sizing agent. Papyrus reeds were layered like onions, placed side-by-side at right angles, hammered together to activate natural plant sap for adhesion, dried under pressure, and smoothed with a hard stone object to create a sizing coating that prevented ink from bleeding. Ancient Egyptians were already using the papyrus plant to make writing surfaces by 3000 BC, exporting it to the Greek and Roman empires.

Traditional Japanese washi paper is made from mulberry tree inner bark cooked, beaten into a soggy mash, and dispersed in water with additives to form strong cellulose mats. The author took a masterclass with traditional papermaker Mandy Brannan at the Institute of Making to make washi paper by hand following precise traditional steps.

• Cook mulberry wood in water and washing soda for four hours
• Beat the slimy mulberry pieces using wooden meat mallets and small rough stones for half an hour
• Drop the mash into a communal water bath and disperse fibres into the liquid
• Add a slippery colourless liquid called polyethylene oxide, or PEO
• Slip mould and deckle vertically down the vat, horizontally along the bottom, and lift through liquid
• Give a gentle shake left and right to help fibres entangle
• Couch the top side of the mould by pressing it onto fabric interfacing and lifting
• Sandwich between towels, clamp between heavy boards, and stand on to squeeze out water
• Unpeel from interfacing and stick to a window using a clean paint roller

Wet paper sticks to glass windows because of polar attractive forces between V-shaped water molecules and silica, which transition to van der Waals forces upon drying, multiplied by high surface area. Polar water molecules have positively charged hydrogen and negatively charged oxygen sides that attract polar silica in glass. When dry, weak van der Waals forces take over, but the fibrous, high-surface-area nature of paper multiplies these forces to hold the paper's weight against the glass.

Parchment, made from stretched and dried animal skins, provided a robust, fold-book-friendly alternative to papyrus due to its hierarchical collagen protein structure. Parchment production and use began in Ethiopia around 800 BC, requiring materials like two hundred sheep to make just one parchment Bible. Medieval European scholars like Hildegard of Bingen wrote and illustrated books on parchment, such as her works featuring her invented language Lingua Ignota.

Johannes Gutenberg's invention of the printing press around 1440 secured paper's material domination by utilizing movable metal letter moulds to rapidly produce text. Gutenberg's system used custom-made moulds for metal letters, allowing individual characters to be arranged for a whole page and pressed onto paper. Paper was much more suitable for this than parchment and aligned well with European alphabets featuring small character sets.

Anne Lister kept a five-million-word diary recording her life and lesbian relationships in a coded language called crypthand, preserved on handmade laid paper. Lister used small handwriting on uniform-sized calfskin-bound volumes made from handmade laid paper from Whiteley's of Halifax. Her diaries were hidden behind a panel at Shibden Hall after her death, later rediscovered by John Lister, decoded, and registered on the UNESCO Memory of the World Register in 2011.

The invention of roll-to-roll continuous paper machines by Louis Nicolas Robert in the 1790s and Bryan Donkin transformed papermaking from a slow batch process into an industrial continuous operation. The Fourdrinier machine replaced mould dipping with a continuous conveyor belt mould, using water jets as squirty scissors, felt and granite rollers to squeeze water, and five hot rollers heated over 100°C to dry both sides before collecting paper on a finished roll. The first Fourdrinier machine was made in 1803 at Frogmore Paper Mill in Apsley, Hertfordshire, powered historically by water wheels.

Carl F. Dahl developed the kraft process in the early 1880s using sodium hydroxide and sodium sulphide to remove lignin from wood pulp and solve the problem of wood-based paper turning brown and brittle. While wood solved the raw material supply shortage for industrial paper, lignin caused paper to yellow and degrade over time. The kraft process broke chemical bonds to remove lignin, leading eventually to modern acid-free paper production.

Paper conservators preserve and restore historical documents by maintaining strictly controlled environmental conditions and using techniques like mold scraping and Japanese paper reinforcement. Zofia Wyszomirska-Noga, artist and paper conservator at The Royal Institution, preserves historical papers like Michael Faraday's lab books and the 1858 transatlantic telegram sent by Queen Victoria within archives spanning 220 years.

• Store paper artefacts in cardboard boxes to allow them to breathe
• Carefully scrape off mold from damaged paper
• Reinforce delicate material with ultra-thin Japanese paper

Paper serves as a vital physical medium through which marginalized and everyday individuals record their identities, connect across time, and achieve cultural immortality. Paper acts as a provisional substrate that gains profound subjective meaning through what is written upon it. The author reflects on how reading historical works by Sappho, Anne Lister, and others helped her deconstruct, rebuild, and express her own identity.

10 Key Ideas

1. Materials science studies substances across multiple length scales, from human-observable textures down to atomic microstructures and quantum sub-atomic levels.
2. Glass is defined by its amorphous molecular network of silicon dioxide, lacking the regimented crystal structures found in ice or metals.
3. The directional layers in sedimentary stone dictate its structural strength and determine how you must orient them during construction.
4. Thermoplastics have weak bonds between molecules that break and reform when heated and cooled, allowing them to be repeatedly melted and recycled.
5. Steel is an alloy made mostly of iron combined with a small amount of carbon, typically two percent or less, arranged in an orderly crystal lattice.
6. Shaping metals through cold-working increases their hardness by tangling dislocations at grain boundaries, while annealing restores their malleability.
7. Progressive vitrification fills pores with glass and forms needle-shaped mullite crystals above 1,000°C inside ceramic kilns.
8. Cold water swimming burns up to 900 calories an hour, requiring continuous carbohydrate consumption like maltodextrin and Jelly Babies to maintain energy levels.
9. Wool consists of keratin proteins forming spring-like coils called microfibrils, which are bundled within a continuous protein matrix surrounded by hydrophobic fatty layers and overlapping exterior scales.
10. Paper serves as a vital physical medium through which marginalized and everyday individuals record their identities, connect across time, and achieve cultural immortality.