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Re:Gallic acid; Was:

Speaking of toning cyanotypes, I recently gave a cyanotype workshop for my book arts group, and we did some toning with tannic acid, using tea. I mentioned that gallic acid was also sometimes used but I'd never tried it. Well, someone from the group just gave me two bags (!) of oak galls. Does anyone know how to extract gallic acid from oak galls-- or even if it's possible?


On Aug 22, 2008, at 5:08 PM, Robert W. Schramm wrote:

BTW cyanotype can be toned to achieve colors other that blue and white.

Good luck with your work and welcome to alternative process printing.

Bob Schramm

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      • From: scienceman200@comcast.net
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      • From: "Robert W. Schramm" <schrammrus@hotmail.com>