Film base: Difference between revisions

Film base (view source)

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 ===Acetate base===
-"Acetate" base in modern exhibition settings usually refers to '''triacetate''' base. '''Diacetate''' was used on some early safety film, but you won't see it very often under normal circumstances (whatever THOSE are!). Older acetate prints tend to be more brittle and prone to warping as they lose moisture. Acetate is thicker and tends to break when stressed, and it can suffer from vinegar syndrome if not stored at the proper temperature and humidity levels. Use only tape or cement splices.
+"Used in the early 1930s mostly for small gauges, then was widely used post 1950s to replace nitrate base. Often refered to as "safety film". Acetate" base in modern exhibition settings usually refers to '''triacetate''' base. '''Diacetate''' was used on some early safety film, but you won't see it very often under normal circumstances (whatever THOSE are!). Older acetate prints tend to be more brittle and prone to warping as they lose moisture. Acetate is thicker and tends to break when stressed, and it can suffer from vinegar syndrome if not stored at the proper temperature and humidity levels. Use only tape or cement splices.
 * [https://www.nps.gov/museum/coldstorage/pdf/2.3.1b.pdf A guide] for making a film viewer for easy identification of acetate or polyester film base. Older polarized 3D glasses (they use spherical polarization) work great for this if you can find some. Real-D glasses do NOT work.