Common dye mordants
Mordants include tannic acid, oxalic acid,[4] alum, chrome alum, sodium chloride, and certain salts of aluminium, chromium, copper, iron, iodine, potassium, sodium, tungsten, and tin.
Iodine is often referred to as a mordant in Gram stains, but is in fact a trapping agent.[3]
https://en.wikipedia.org/wiki/Mordant
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