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Answer for the clue "Chemical salt in some black inks ", 7 letters:
tannate

Alternative clues for the word tannate

Word definitions for tannate in dictionaries

Wiktionary Word definitions in Wiktionary
n. (context organic chemistry English) Any salt or ester of tannic acid

Wikipedia Word definitions in Wikipedia
A tannate is the salt or ester of tannic acid . Albumin tannate (also known as Tannin albuminate) is an antidiarrheal.

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Tannate \Tan"nate\, n. [Cf. F. tannate.] (Chem.) A salt of tannic acid.

Usage examples of tannate.

They react with the green vitriol, which in Grantville is called iron sulfate, to form the dark iron tannate and gallate.

When iron relics 2,000 years old were discovered recently in ordinarily destructive soil at Hungate, York, England, chemical tests of the soil in which they were found disclosed that tannates from an ancient shoe factory had seeped into the ground, the tannates apparently preventing rusting of the iron.