Tag Archives: palladium printing

Thinking out loud: Ferro-gallate Printing for Photographs.

This is just something that happened to occur to me this morning, while brewing a pot of tea, of all things.

Ferric oxalate (Fe2(C2O4)3), familiar to those who have dabbled in platinum/palladium printing, is a photo-sensitive chemical that reduces to ferrous oxalate (FeC2O4) upon exposure to ultraviolet light. If ferrous oxalate were “developed” with gallic acid or a suitable,  soluble gallate salt, then the ferrous gallate (which is the key component of iron-gall ink) formed could create a dark, contrasty image.

I should point out that all this is conjecture, and practical experimentation would be needed to prove the theory.

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Filed under Alternative processes, Black & White, Chemistry, Experimentation