Main Page | See live article | Alphabetical index Gallic acid is an organic acid, also known as 3,4,5-trihydroxybenzoic acid, found in gallnuts, sumac, witch hazel, tea leaves, oak bark, and other plants. The chemical formula is C6H2(OH)3CO2H. Gallic acid is found both free and as part of tannins. External Link King's American Dispensatory (1898) entry on Gallic acid This is a stub. This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.