The Mordant reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Mordant

A mordant is a substance used to set dyes. A mordant is either collodial, or produces colloids and can be either acidic or basic.

Tannic acid, alum, chrome alum, and certain salts of aluminum, chromium, copper, iron, potassium, and tin.

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A mordant in music is also a type of musical ornament: see Ornament

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