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I Miss my Viewfinder !
"Mxsmanic" wrote in message ... Eric Stevens writes: Which is coated with gelatine. Not after development. An image in metallic silver on glass is very stable. You can go even further by etching the glass. The gelatine is not removed during the developement process for common garden variety films. (There may be some older or less common processes where it is removed). The metallic silver image is held in place by the gelatine on the glass plate or film. For color films, the metallic silver image goes away in the developement process, leaving a stable dye image in the gelatine. In some developing processes, the gelatine is hardened to make it more rugged. But the gelatine does remain in place over the entire film for it's life. Etching processes sometimes rely on the "selective" removal of the gelatine: where there is an image, the gelatine remains to protect the substrate from the etching chemical. After the etching chemical has done it's work of etching the substrate, the remaining gelatine would be removed. This sort of process might be used for making printing plates or printed circuit boards. Such an etched substrate would be very stable, but it's not really a common method for keeping and displaying photographs. |
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