Mordant dyes are acid dyes that have special sites other
than acid salt anion groups that can react with a metal salt mordant. Mordant dyes are "tailor-made" to chelate with metal ions to form a strong
organometallic complex of limited solubility and greater colorfastness .
The fiber may be dyed initially and then mordanted (postmordanting), dyed
and mordanted simultaneously (comordanting), or mordanted and then dyed
(premordanting) . Of the three methods, postmordanting is preferred. Salts
of chromium, aluminum, copper, iron, tin, and cobalt are commonly used as
mordants. Since the mordant affects the electron distribution and density
within the dye, the color of the dyed fabric tends to change.
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