[alt-photo] Re: stability of chemigram colors

[Ryuji Suzuki]

What was the material/protocol to produce the test specimen?

What was the humidity and temperature of the test condition?

I actually think that a small difference in pollutants in the
air, and modest change in humidity may have sizable influence
on the test outcome, not just the amount of UV-B, even if the
material and processing are the identical.

--
Ryuji Suzuki
"People are sick in this country because they are poisoned [...]
they poison themselves. To my way of thinking why about 90% of people
are sick is because they eat shit---Bill Maher (2007)"

From: douglas collins <dougcollins99 at gmail.com>
Subject: [alt-photo] stability of chemigram colors
Date: Sun, 28 Aug 2011 13:57:59 -0400

> Hello list,
> 
> Most of us who use color are aware of the harmful long-term effects of
> ultraviolet radiation on our dyes or pigments (gum bichromates, Epson
> pigment prints, etc), but few have probably thought about the stability of
> chemigram colors, which use none.  We've done a little testing of the latter
> over a 100 year span - a very impressionistic test - and the results are
> posted on our blog at
> http://nonfigurativephoto.blogspot.com/2011/08/lightfastness-of-chemigram-colors.html
> .
> 
> We find that these colors also degrade or shift, even though they are free
> of dyes or pigments.  Apparently the high-energy UV-B radiation is able to
> cause movements among small grains within the emulsion.  Chemigramists will
> find this interesting.
> 
> Regards
> Douglas Collins
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