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This is 10g of Tannic Acid from Photographers' Formulary. It is commonly used as a reducer during the development process and is also used extensively in the preparation of dry plates for the Tannin Process of Major Russell.
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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
Tannic acid, a commercial form of tannin is not a true acid but an acid-like substance called a polyphenol.