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From: smith@umn-cs.UUCP (Richard Smith)
Newsgroups: net.rec.photo
Subject: Re: Re: Cibachrome dyes - (nf)
Message-ID: <477@umn-cs.UUCP>
Date: Fri, 22-Jun-84 21:03:11 EDT
Article-I.D.: umn-cs.477
Posted: Fri Jun 22 21:03:11 1984
Date-Received: Wed, 27-Jun-84 01:38:42 EDT
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Organization: Computer Science Dept., U of Minn, Mpls, MN
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#R:idi:-19400:umn-cs:9000018:000:652
umn-cs!smith    Jun 22 11:55:00 1984

Re: Cibachrome dye permanence

  Hmmm.  According to Peter Krause in one of the several Krause & Shull
books on Cibachrome, the dyes are pure azo dyes.  Now, I don't know much
about dyes, but azo dyes ARE carbon compounds.  But I don't think that
the organic-ness of the dyes is the point.  The point is that the pure
dyes are built right into the paper and NOT formed or activated during
processing.  The dyes don't depend on a complex reaction to acquire their
color.  Many other (read "Kodak") color processes don't start out with
the dyes; the dyes are usually produced during processing.

Rick.
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