RE: Kodak ST-34 grayscale
RE: Kodak ST-34 grayscale
- Subject: RE: Kodak ST-34 grayscale
- From: "Dennis W. Manasco" <email@hidden>
- Date: Sun, 27 Mar 2005 04:59:50 -0600
At 9:59 PM -0500 3/26/05, Mike Eddington wrote:
While the removal/bleaching out of residual silver holds true for
positve chromes, is this the case for nagatives as well?
If it's color, or chromogenic black and white, it's just dye clouds.
All of the silver is gone by the time it comes out of the bleach.
I'm also of the opinion that incomplete bleaching of silver can
cause color casting upon scanning.
I'd think more like muddy shadows and blocked highlights, but who knows.
Regardless, I don't think you'll find many commercial processors
whose bleach cycle doesn't remove all of the silver. (Or at least
enough of it that you'd need to melt the emulsion into solution and
mess with a chromatograph to find it.)
I broached this topic a long while back and was told that you could
check for residual silver with an infrared light.
Anyone ever heard of this? It'd be a lark to try, but I can't see how
you'd do the test.
Now if it was checking with UV that was recommended instead it'd be
easy enough to do, but I can't remember ever hearing about UV
fluorescence from silver and, intuitively, I doubt that there is any.
Can anyone comment?
I'd be surprised to find that you can find silver with secondary
emissions from UV exposure, but I'd like to know whether it's
possible.
(Though I think I'll just look at some old B&W under a black light anyway... :)
Best wishes,
-=-Dennis
.
.
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