gallic acid

American  

noun

Chemistry.

1. a white or yellowish, crystalline, sparingly water-soluble solid, C 7 H 6 O 5 , obtained from nutgalls, used chiefly in tanning and in ink dyes.

---

gallic acid British  

noun

1. a colourless crystalline compound obtained from tannin: used as a tanning agent and in making inks, paper, and pyrogallol; 3,4,5-trihydroxybenzoic acid. Formula: C 6 H 2 (OH) 3 COOH

---

Etymology

Origin of gallic acid

First recorded in 1785–95, gallic acid is from French acide gallique

Example Sentences

The researchers determined that Carolina azolla has a total phenolic content of about 4.26 grams, gallic acid equivalents per kilogram dry weight.

From Science Daily • Feb. 23, 2024

By comparison, he added, other species of azolla that grow in Asia and Africa are between 20 and 69 grams, gallic acid equivalents per kilogram dry weight -- too high for humans to digest comfortably.

From Science Daily • Feb. 23, 2024

Mr. Claudet sends some good pictures enlarged by solar camera, and developed with gallic acid.

From The Evolution of Photography With a Chronological Record of Discoveries, Inventions, etc., Contributions to Photographic Literature, and Personal Reminescences Extending over Forty Years by Werge, John

With phosphorus oxychloride at 120� C. gallic acid yields tannic acid, and with concentrated sulphuric acid at 100�, rufigallic acid, C14H8O8, an anthracene derivative.

From Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 4 "G" to "Gaskell, Elizabeth" by Various

I excite my paper with equal proportions of saturated solution of gallic acid and aceto-nitrate of silver, one or two drops of each to the drachm of distilled water.

From Notes and Queries, Number 229, March 18, 1854 A Medium of Inter-communication for Literary Men, Artists, Antiquaries, Genealogists, etc by Various