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Cellulose diacetate and cellulose triacetate are both used as bases for motion picture film, but they differ in their degree of acetylation and other properties: Degree of acetylation: Triacetate has a higher degree of acetylation than diacetate, with at least 92% of its hydroxyl groups acetylated compared to diacetate's average of two out of three. Heat resistance: Triacetate is more heat resistant than diacetate. Durability: Triacetate is more durable than diacetate. Water solubility: Triacetate is water-insoluble and hydrophobic, while diacetate is more readily dissolved in acetone. Cellulose diacetate was first used in 16mm cinema films and some sheet film, but was gradually replaced by triacetate in the late 1940s. Source: Internet <><><><> Sitting Bull 1884 - American Indian L.O.C. / D.D. Teoli Jr. A.C. <><><><> Daniel D. Teoli Jr. Archival Collection Daniel D. Teoli Jr. Small Gauge Film Archive Daniel D. Teoli Jr. Advertising Archive Daniel D. Teoli Jr. VHS Video Archive Daniel D. Teoli Jr. Popular Culture Archive Daniel D. Teoli Jr. Audio Archive Daniel D. Teoli Jr. Social Documentary Photography