Silver in color chromes and negatives
Silver in color chromes and negatives
- Subject: Silver in color chromes and negatives
- From: "Mark Rice" <email@hidden>
- Date: Sun, 27 Mar 2005 15:49:21 -0500
- Organization: Zero One
Color negatives also have all the silver bleached out. What is left is the
dye, plus an orange "mask" for color corrections in certain colors that are
too "dirty" for good color negatives.
Incomplete bleaching virtually never occurs at a commercial color lab,
unless it is very poorly run. It can occur in home color processing, if
anyone ever does that anymore. It produces a visible sheen on the chrome or
negative, similar to an oil slick in color. It would definitely cause weird
effects in scanning, but I don't have any experience with it ( I wouldn't
scan a chrome or negative with that effect - I would rebleach it and fix it
instead.)
Mark Rice
email@hidden
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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