Tannic acid suppliers

Tannic acid

CAS:: 1401-55-4

MF:: C76H52O46

MW:: 1701.2

SecurityInformation

Symbol(GHS) ：: GHS07

Signal word ：: Warning

Hazard statements ：: H303

Precautionary statements ：: P270-P301+P312-P403-P501c

Hazard Codes ：: Xi,Xn

Risk Statements ：: 40-62-63-68-36/37/38-52/53

Safety Statements ：: 24/25-36-26-36/37/39-22-61

WGK Germany ：: 2

RTECS ：: WW5075000

Autoignition Temperature：: 980 °F

TSCA ：: Yes

HS Code ：: 32019090

Toxicity：: LD50 oral in rabbit: 5gm/kg

Use：: Tannic acid is a powder extracted from gall nuts that is soluble in water but less so in alcohol. Tannic acid was used by Major Russell in the mid-1850s for the tannin process of preparing dry collodion plates. The collodion plate was coated and sensitized as usual but the excess silver was then washed completely from the surface. A solution of tannic acid was then poured on and off the plate and the collodion film allowed to dry completely in the dark. The tannin plate could be preserved for months prior to exposure. The exposed plate was developed in pyrogallic acid, citric acid, and silver nitrate to replace that which was washed off during the initial preparation. The exposures required for tannin plates were as much as five times longer than wet collodion plates, which made them suitable only for landscape work.

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