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To: Jon Koplik who wrote (23899)	3/9/1999 10:42:00 AM
From: J.B.C.	Read Replies (1) \| Respond to of 152472

Any film that goes through a "developing" process uses silver, including movie film. Jim

To: Jon Koplik who wrote (23899)	3/9/1999 11:18:00 AM
From: JGoren	Respond to of 152472

Black and white film uses a silver coating. I thought color film only uses dyes and not any silver, but I could be wrong.

To: Jon Koplik who wrote (23899)	3/9/1999 6:58:00 PM
From: Drew Williams	Respond to of 152472

<<Anyone know whether or not "film" (as in movie theaters) uses silver (or silver halide or whatever it is) ?>> The color negative film that goes through the movie camera does indeed still use silver, although not nearly as much as it used to. Silver is removed from color film during processing and is replaced by dyes. The film being projected in your local cineplex has no significant silver content. Conventional black and white films leave silver remaining in both negative and the positive images. The black is a metallic silver compound -- Silver Halide reduced from Silver Bromide, if memory serves. (I did a science project on this back in 8th grade -- a loooong time ago.) Kodak and Ilford both market black and white films that go through the same chemical processes as do color films. In these cases, they too have all the silver removed and replaced by dyes. There was a time that photo labs made more money recycling the recovered silver than they did from photofinishing.

To: Jon Koplik who wrote (23899)	3/9/1999 8:40:00 PM
From: John Stichnoth	Read Replies (1) \| Respond to of 152472

Jon, to follow up on one of the responses. My understanding is that there is fairly substantial amount of silver before processing. But my (dim) memory remembers that Kodak has a very aggressive campaign in place to recapture all of the silver that processing removes from the film. This is then reused, of course, in the manufacture of new film. This recycling is done both for economic and ecologic reasons. (I seem to remember Kodak touting their recycling efforts a few years back). The result would be that the film industry uses surprisingly little silver bought in the open market. JS