Tannic Acid
Tannic acid is a basic ingredient in the chemical staining of. The tannic acid or tannin is already present in woods like, Tannic acid can be applied to woods low in tannin so chemical stains that require tannin content will react. The presence of tannic acid in the bark of is a strong natural defense against, and infestation by certain insects such as. Tannic acid is a common used in the dyeing process for fibers such as, often combined with and/or. The tannin mordant should be done first as metal mordants combine well with the fiber-tannin complex.

Tannic acid is a polymer of gallic acid molecules and glucose. It the example there are 3 gallic acid molecules, but normally there are about 8. Because there are different molecular structures for tannic acid it would have been better to speak about tannic acids (in plural). Tannic acid will hydrolyze into glucose and gallic or ellagic acid units. Tannic acid is odourless but has a very astringent taste. Pure tannic acid is a light yellowish and amorphous powder.

Specification:
Name: Tannic acid
Formula: C76H52O46
Appearance: Light yellow or light brown powder.

(a) Industrial Tannic acid
Purity: 81% min or 83% min
Moisture: 9.0%%max
Water insoluble: 0.6% max
Color: 2.0 max

(b) Food grade Tannin: Light yellow powder (up to standard of FDA "Food chemical standard"(Version 3rd), The United States food chemical code standards(1981), UAS FCC-IV STANDARD)
Purity: 93% min
Drying loss: 9% max
Loss on ignition: 0.2% max
As: 3ppm max
Pb: 0.004% max
Packing: Cardboard casket package, N. W25kg.

(c) Dyestuff grade Tannin88%Min
(d) Medical grade Tannic acid
Purity: 90% min
Water insoluble matter: 0.2% max
Drying loss: 9% max
Loss on ignition: 0.2% max
Gallic acid content: 7% max
Color: 2.0 max
Packing: N. W25kg fiber drum.

(e) Beer use Tannin
Beer Glycation Tannin 95%min
Beer Brewing Tannin 97%min
(f) Electronic grade Tannin
Electronic grade Tannin 99%min

Application:
1. Tannage, ink making, paper sheet, silk gluing, boiler cleaning media and so on.
2. Dying Intermediary reagent.
3. Beer and vinaceous clarifying agent
4. Rubber coagulator.
5. Pharmaceutical grade tannic acid as the as haemostatic.

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