Page "Film stock" Paragraph 14

Amateur filmmaking ( home movies ) slowly developed during this period.

Kodak developed a heat-resistant ' safety base ' for home projection.

In 1909, tests showed cellulose diacetate to be a viable replacement base, and Kodak began selling acetate-base films the following year in 22 mm widths for Edison's work on the Home Kinetoscope, which was commercially released in 1912.

Eastman Kodak introduced a non-inflammable 35 mm film stock in 1909.

The plasticizers used to make the film flexible evaporated quickly, making the film dry and brittle, causing splices to part and perforations to tear.

In 1911 the major American film studios returned to using nitrate stock.

More amateur formats began to use acetate based film, and several, including Kodak's own 16 mm format, were designed specifically to be manufactured with safety base.