Tannic acid

Tannic acid is found in the nutgalls formed by insects on twigs of certain oak trees (Quercus infectoria and other Quercus species). It is removed and used as medicine.
Historically, tannic acid was used along with activated charcoal and magnesium oxide in the “universal antidote,” formerly used for poisoning. These three ingredients in combination were believed to work better at absorbing poisons than any of the ingredients alone. Unfortunately, the activated charcoal soaked up the tannic acid, more or less inactivating it. This made the combination less effective.
These days, people apply tannic acid directly to the affected area to treat cold sores and fever blisters, diaper rash and prickly heat, poison ivy, ingrown toenails, sore throat, sore tonsils, spongy or receding gums, and skinrashes; and to stop bleeding.

Specification

• Appearance Light yellow powder
• Purity 92% min
• Loss on drying 9.0% max
• Residue on ignition 0.1% max
• Heavy metal 20ppm max
• Arsenic 3ppm max
• Total color 2.0max