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Fine crystals, white yellowish-white or pale, fawn-colored Odorless colorless crystalline organic acid found in gallnuts, sumach, tea leaves, oak bark, and many other plants.
In the production of azo dyes and photographic developers
When heated above 220°C, gallic acid loses carbon dioxide to form pyrogallol, or 1,2,3-trihydroxybenzene, C6H3(OH)3. Keep in a tightly closed container, stored in a cool, dry, ventilated area. Protect against physical damage. Protect from light.