ring color test
A test designed to determine the presence of
different tanning agents used in the manufacture
of leather. Concentrated sulfuric acid is added to
a small quantity of the test solution of ground
leather fibers mixed with water. A dark red ring
will form at the juncture of the two liquids in
the case of a condensed tannin, while a pyrogallol
tannin gives a yellow or brown ring. (291 )
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