On Tue, 4 Oct 2005, Loris Medici wrote:
>
> Maybe one can coat unpigmented gum-dichromate mixture over cyanotype,
> fog it and then clear the dichromate stain (if present) in sulfuric acid
> (or sodium sulfite; but I don't know the PH of the latter, if it's
> alkali then it will bleach the underlying cyanotype)... What do you
> think? How many coats it will take to get adequate sheen which will open
> the shadows a little bit and increase dmax?
The gum gets hazier when it's hardened. Very annoying of it.
J.
Received on Tue Oct 4 21:34:37 2005
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