Bible Dictionaries
Congo Group
Webster's Dictionary
A group of artificial dyes with an affinity for vegetable fibers, so that no mordant is required. Most of them are azo compounds derived from benzidine or tolidine. Called also benzidine dyes.
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Bibliography Information
Webster, Noah. Entry for 'Congo Group'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/c/congo-group.html. 1828.