General Electric also developed a flashbulb referred to as the Sashalite around the identical time. The disadvantage to nitrate-based film was that it was flammable and tended to decay over time. Kodak and different manufacturers started switching to a celluloid base, which was fireproof and extra sturdy, in the 1920s. Triacetate movie came later and was more secure and versatile, in addition to fireproof. Most films produced as much as the 1970s were based mostly on this know-how. Since the 1960s, polyester polymers have been used for gelatin-based films.
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