(1)Used as astringent and internal hemostatic agents in urinary system.

(2)Used to make permanent blue ink for writing.

(3)Used as processing agent in stencil printing and lithographic printing.

(4)Used as a photographic development aid.

(5)Used for silver halide solution in photography to achieve long-term storage stability and eliminate the unclear problem on the negative.

(6)This product is a bonding agent for cyanoacrylate adhesives.

(7)Used in tanning and hair dyeing preparations.

(8)Used as colloidal stabilizer in siding production.

(9)Used as mordant in the production of colored paper and colored fiberboard.

(10)By adding 0.01-0.04%(by weight)of gallic acid in gypsum-based building grid formula,the strength can be improved.

(11)Used as an analytical reagent for alkaloids,metals and inorganic acids.

(12)This product is an important organic material.For example:

①It is a sulfanilamide synergist in production of TMP.

②It is used for manufacturing Propyl gallate-a food antioxidant that has a synergistic effect on both BHT and BHA.

③It is used for producing dyes like Alizarin,thioflavin,gallocyanine,etc.

④It is used for making pyrogallol.

⑤It is used for making gallate,such as bismuth subgallate,a powder for treating skin diseases