Mordant
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A mordant or dye fixative is a substance used to set dyes on fabrics. It does this by forming a coordination complex with the dye, which then attaches to the fabric. It may be used for dyeing fabrics
A French Indienne, a printed or painted textile in the manner of Indian productions, which used mordants to fix the dyes
Dye rot from iron mordant
Teinture naturelle Millepertuis 2
Alum
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An alum is a type of chemical compound, usually a hydrated double sulfate salt of aluminium with the general formula XAl2·12H2O, such that X is a monovalent cation such as potassium or ammonium. By it
Mordant
…III). The resulting coordination complex of dye and ion is colloidal and can be either acidic or alkaline. Mordants include tannic acid, oxalic acid, alum, chrome alum, sodium chloride, and certain salts of aluminium, chromium, copper, iron, iodine, potassium, sodium, tungsten, lead, and tin. Iodine is…
Crystal of potassium alum, KAl(SO4)2·12H2O
Crystal of potassium alum
Tawas (powdered alum crystals), a traditional scent-less deodorant for underarm and feet odor in the Philippines and most of Island Southeast Asia
Chrome alum crystal