RE: Kodak ST-34 grayscale
RE: Kodak ST-34 grayscale
- Subject: RE: Kodak ST-34 grayscale
- From: "Mike Eddington" <email@hidden>
- Date: Sat, 26 Mar 2005 21:59:50 -0500
- Thread-topic: Kodak ST-34 grayscale
Title: RE: Kodak ST-34 grayscale
<By the time they reach the scanner they are dyes
dear boy, merely dyes.
Which means that they are transparent to a degree
which silver grains are
not.>
< No, chromes are exposed to the silver contained in
them. The silver is
"coupled" to a dye. The dye is formed during color
development, and then all
the silver is bleached out of the
chrome.>
Ok, I'm convinced. Thanks for all the informative
feedback! After seeing that there is a lot of chemisrty involved that I'm
not too familiar with, I cracked open my Chemistry for the Graphic Arts book.
While the removal/bleaching out of residual silver holds true for positve
chromes, is this the case for nagatives as well? It appears that only the
un-exposed silver is washed away in this case.
I'm also of the opinion that incomplete bleaching of
silver can cause color casting upon scanning. I broached this topic a long while
back and was told that you could check for residual silver with an infrared
light. I haven't actually checked suspect transparencies in this manner, but has
anyone had similar experiences?
mike
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