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I Miss my Viewfinder !



 
 
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Old June 3rd 11, 05:40 PM posted to rec.photo.equipment.35mm
K W Hart
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Posts: 142
Default 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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