FotoDave@aol.com
Date: 05/18/00-12:19:42 AM Z
> How stable is the pyro stain? Does it fade like the dyes in a color
negative,
> or is its stability similar to that of the silver image?
Robert Chapman (or is it Richard Chapman? the one who writes the photo
chemistry column in Photo Technique, used to be Darkroom and Creative Camera)
had an article on pyro stain. According to him, all stain fades and although
he didn't give a figure, he said that he would not trust the stain for
critical images.
But I think that since negatives are not the final display products, they are
usually stored in the dark, so the longetivity is better. Also, as long as
the information (the silver density) is preserved, I guess one can always
make a duplicate negative and develop in pyro again, or I suppose the
original negative can be bleached and redeveloped in pyro again.
Dave Soemarko
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