Dear Dave-
According to Mike Ware, in his "Cyanotype" book-
"The most likely cause of light-sensitivity in cyanotypes is the incorporation
within the image substance of impurities which derive from the sensitiser."
He describes the "Prussian blue lattice" in great detail. This lattice
describes the molecular structure of Prussian blue. However, I got a "D" in
hight school chemistry, so....
I recommend his book to all those interested in cyanotypes.
Best,
Dan Donovan
FotoDave@aol.com wrote:
>
> Hi, I have always wanted to try cyanotype but so far haven't, so it's so to
> follow the recent thread of cyanotype.
>
> I am wondering if anyone knows the chemical action of a cyanotype print
> *after* it is developed, not during development since the latter has been
> described in some books. In particular, I read that it can fade under light
> and then restore to its tone after storage in dark. What is going on there? I
> also read that after exposure and development, you basically get Prussian
> blue as the image, but if we use Prussian blue watercolor or paint, we don't
> seem to have the problem of fading as described in cyanotype print (at least
> I have never heard or read about that in artists' books).
>
> If you don't know the exact answer, I would still appreciate it if you could
> point me to some direction especially if you are familiar with chemistry.
>
> Thanks in advance!
>
> Dave Soemarko
>
> ==================================================
> === See Soemarko's Direct Carbon (alternative) process at
> === http://hometown.aol.com/fotodave/SDC/SdcIndex.html
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