The Probert Encyclopaedia of Science & Technology

GALLIC ACID

Gallic Acid (Trihydroxy-benzoic Acid) is an acid which was first procured from the gall-nut by Scheele in 1786. It occurs in the seeds of the mango, acorn, tea, walnut and many other plants and is a decomposition product of tannic acid. It crystallizes in brilliant colourless prisms, with an astringent taste. It colours ferric salts of a deep bluish-black. It is used as an important black dye and is an ingredient in ink.
Research Gallic Acid