Celluloid refers to a natural resin formed from plant fibers, used commonly before the second world war as a material for pen barrels and caps (and many other consumer products, as well as motion picture film stock). Celluloid is strong and resilient, but cannot be injection molded and is highly flammable. Also known as Radite, Pyroxalin, Pyralin, Permanite, etc.
Celluloid is pertaining, likewise, to a thermoplastic material made by the intimate blending of cellulose nitrate with camphor. Alcohol is normally employed as a volatile solvent to assist plasticization, and is subsequently removed.
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