Mordant
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Not to be confused with mordent.
A mordant is a substance used to set dyes on low-polarity fabrics. A mordant is either inherently colloidal or produces colloids and can be either acidic or alkaline.
Mordants include tannic acid, alum, chrome alum, sodium chloride, and certain salts of aluminum, chromium, copper, iron, iodine, potassium, sodium, and tin.
Iodine is used as a mordant to set the first dye in Gram stains.
Phosphomolybdic acid is used as a mordant to set light green when staining with Masson's Trichrome.
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