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Film base: Difference between revisions
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===Acetate base=== | ===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 | "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 work great for this if you can find some. Real-D glasses do NOT work. | * [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 work great for this if you can find some. Real-D glasses do NOT work. | ||
===Nitrate=== | ===Nitrate=== | ||