TANNIC ACID AR
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Tannic acid is a light yellow to tan solid with a faint odor. Sinks and mixes with water. ( USCG, 1999) CAMEO Chemicals. Polyphenolic compounds with molecular weights of around 500-3000 daltons and containing enough hydroxyl groups (1-2 per 100 MW) for effective cross linking of other compounds (ASTRINGENTS).
In foods and beverages, tannic acid is used as a flavoring agent. In manufacturing, tannic acid is used in ointments and suppositories; for tanning hides and manufacturing ink; and to kill dust mites on furniture.
Dosage
No more than 2 daily cups of tea that are very tannic (like black tea), and you'll be alright.