Making Celluloid — The First Synthetic Plastic That Changed Everything

Work in a well-ventilated area away from all open flames and heat sources. Celluloid is highly flammable — it contains nitrocellulose, essentially solid guncotton. Wear chemical splash goggles, nitrile gloves, and a lab coat. The solvents used (ethanol or acetone) are also flammable. Have a fire extinguisher rated for chemical fires immediately accessible. Never heat celluloid with an open flame — use only hot water baths.

Start with 10 g of nitrocellulose prepared as in the guncotton blueprint — thoroughly washed, neutralised with sodium bicarbonate, and stored wet. Squeeze out the excess water gently. The nitrocellulose should feel like wet cotton wool. If using pre-made nitrocellulose (available as 'collodion cotton' or 'pyroxylin'), soak in water first to ensure it is safely wet before handling. Never handle dry nitrocellulose in bulk — it is shock-sensitive and can detonate.

Transfer the wet nitrocellulose to a glass beaker and add 50 ml of ethanol (95% denatured alcohol). Stir until the nitrocellulose dissolves into a thick, viscous, clear solution — this is essentially collodion, the same solution used in early photography. The ethanol replaces the water and dissolves the nitrocellulose chains. If the solution is too thick, add more ethanol in 10 ml increments. Ensure good ventilation — ethanol vapour is flammable.

Weigh 3 g of camphor — a white, waxy, crystalline solid with a distinctive penetrating aromatic odour. Camphor is a bicyclic terpene (C₁₀H₁₆O) traditionally extracted from the wood of the camphor laurel (Cinnamomum camphora). Add the camphor to the nitrocellulose-ethanol solution and stir until completely dissolved. The camphor is the plasticiser — its molecules intercalate between the rigid nitrocellulose chains, reducing intermolecular forces and making the material flexible. Hyatt's key insight was that camphor, unlike other solvents, remains in the dried product permanently.

Pour the clear, viscous solution into a shallow glass or metal mould — a petri dish, a small baking tin, or between two glass plates separated by spacers. Spread to an even thickness of 2–3 mm. The thinner the casting, the faster and more evenly the solvent evaporates. Cover loosely with a clean cloth to prevent dust settling on the surface while allowing the ethanol to evaporate. Work in a ventilated area — the ethanol vapour must not accumulate.

Leave the casting undisturbed for 24–48 hours in a well-ventilated area at room temperature. As the ethanol evaporates, the solution solidifies into a translucent, rigid sheet — celluloid. The camphor remains trapped between the nitrocellulose chains, acting as a permanent plasticiser. The sheet may curl slightly at the edges as it shrinks — this is normal. Do not attempt to accelerate drying with heat — the combination of ethanol vapour and heat near nitrocellulose is extremely dangerous.

Peel the dried celluloid sheet from the mould. It should be a translucent, slightly yellowish, rigid but flexible sheet — it bends without breaking, springs back when released, and can be cut with scissors. Hold it up to the light: genuine celluloid is translucent with a warm amber tint. It has a faint camphor odour. This is the same material that made the first photographic roll film (Eastman Kodak, 1889), the first motion picture film (the Lumières, 1895), and countless everyday objects from combs to collar stays to ping-pong balls.

Cut a small strip of celluloid (2 × 5 cm) and immerse in water at 70–80 °C (NOT boiling — celluloid's ignition point is only about 150 °C). After 30 seconds, the strip becomes soft and pliable — you can bend it, twist it, or press it into a new shape. Remove from the water and hold in the desired shape while it cools. Within a minute, the celluloid has hardened again in its new form. This thermoplastic behaviour — softening reversibly with heat — is what made celluloid the first truly mouldable plastic. It could be shaped into any form by heating and pressing.

Store celluloid sheets flat in a cool, dry place away from heat sources and sunlight. Label: CELLULOID — FLAMMABLE. Celluloid degrades slowly over decades, releasing nitric acid fumes and camphor — this is why early cinema films crumble and self-combust in archives. Hyatt's 1869 invention — nitrocellulose plus camphor — was the first synthetic plastic: the first material made by human chemistry that did not exist anywhere in nature. It opened the door to Bakelite (1907), nylon (1935), polyethylene (1933), and the entire modern plastics industry that shapes the material world today.