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July 4, 2011

MORDANT DYE


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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