Mordant
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- For the type of musical ornament mordent (note the different spelling), see Ornament
A mordant is a substance used to set dyes. A mordant is either inherently colloidal or produces colloids and can be either acidic or basic.
Mordants include tannic acid, alum, chrome alum, and certain salts of aluminum, chromium, copper, iron, iodine, potassium, and tin.