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Review Summary
2018-11-12T10:37:34
I bought this tannic acid to tone cyanotypes. It worked well to tone cyanotype prints brown to black depending on different water ratios.
robert t.
Tannin is a name applied to vegetable substances possessing acid properties and having an astringent taste, and which produce, with iron salts, a dark precipitate or solution, and precipitate albumen and gelatin
A yellowish to brownish powder Characteristic odor
As a mordant, In the preparation of the dry plates by the Tannin Process of Major Russell & Tannic acid toning of cyanotypes
C76H52O46
10g (0.35oz)
675152145338
Tannic Acid
By robert t.
I bought this tannic acid to tone cyanotypes. It worked well to tone cyanotype prints brown to black depending on different water ratios.
Tannic Acid is commonly used as a Reducer, as a mordant, In the preparation of the dry plates by the Tannin Process of Major Russell and Tannic acid toning of cyanotypes.
Note:
Tannic acid, a commercial form of tannin is not a true acid but an acid-like substance called a polyphenol.