Re: coated cyanotypes


Luis Nadeau (nadeaul@nbnet.nb.ca)
Fri, 12 Feb 1999 09:31:48 -0400


At 2:06 AM 99/02/12, Judy Seigel wrote:

>I've tried all cyanotype toners on record (except your acrylics). The ones
>that work use tannic acid, and they don't, as far as I'm aware, fade -- or
>if so, only slowly over 20 or 50 years.

Two tannic acid toned prints in my collection, from the same artist, show
noticeable fading after 10-15 years. I don't have them at hand but they are
on fine Arches papers if I recall properly.

>> .... Would complete isolation from air
>> and substrait with the possibility of oxidation, stop the degrading or is it
>> an internal, light oriented thing?

Keeping things in a vacuum is not practical imo. There are hundreds of
variables, depending on paper fillers, processing, etc., so you'll never
get a definite answer from anyone. If permanence is of concern, use pigment
processes. They are the most predictable as far permanence goes.

Luis Nadeau
NADEAUL@NBNET.NB.CA
Fredericton, New Brunswick, Canada
http://www3.nbnet.nb.ca/nadeaul/



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