Uses
Most movie and photography films prior to the widespread move to acetate films in the 1950s were made of celluloid. Its high flammability was legendary since it self-ignites when exposed to temperatures over 150 °C in front of a hot movie-projector beam. While celluloid film was standard for 35mm theatrical productions until around 1950, motion-picture film for amateur use, such as 16mm and 8mm film, were on acetate "safety base", at least in the US. Celluloid was useful for producing cheaper jewellery, jewellery boxes, hair accessories and many items that would earlier have been manufactured from ivory, horn or other expensive animal products.[10] In these applications it was often referred to as "Ivorine" or "French Ivory", after a form of celluloid developed in France with grain lines in made to resemble ivory.[11] It was also used for dressing table sets, dolls, picture frames, charms, hat pins, buttons, buckles, stringed instrument parts, accordions, fountain pens, cutlery handles and kitchen items. The main disadvantage the material had was that it was flammable. It was soon overtaken by Bakelite and Catalin. Soviet roly-poly dolls were made from celluloid on smokeless powder plants until 1996, and table tennis balls until 2014. Parker Brothers made diabolos out of celluloid that owing to low friction of celluloid were said to spin "even faster than steel".[12]
Shelf clocks and other furniture items were often covered with celluloid in a manner similar to veneer. This celluloid was printed to look like expensive woods, or materials like marble or granite. The Seth Thomas clock company bought rights for its use as a durable coating from Celluloid Manufacturing Company in September, 1880 and marketed it as, "Adamantine".[13] Celluloid enabled clockmakers to make the typical late Victorian style of black mantel clock in such a way that the wooden case appeared to be black marble, and the various pillars and other decorative elements of the case looked like semi-precious stone.[14]
Celluloid was also a popular material in the construction of slide rules. It was primarily used to coat wooden slide rule faces, such as in early A.W. Faber rules, as well as cursor end pieces, such as in Keuffel and Esser rules.
Celluloid remains in use for musical instruments, especially accordions and guitars. Celluloid is very robust and easy to mold in difficult forms, and has great acoustic performance as cover for wooden frames since it does not block wood's natural pores. Instruments covered with celluloid can easily be recognized by the material's typical nacre-like flaming pattern. Thick celluloid panels are cooked in a bain-marie which turns them into a leather-like substance. Panels are then turned on a mold and allowed to harden for as long as three months.
