Subject UnknownWhich of the following is a mordant dye?

Which of the following is a mordant dye?

  1. A
    Aniline black
  2. B
    Congo red
  3. C
    Alizarin
  4. D
    Indigo 

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    Solution:

    Congo red is an organic compound, the sodium salt of 3,3′-bis. It is an azo dye. Congo red is water-soluble, yielding a red colloidal solution; its solubility is greater in organic solvents. However, the use of Congo red has long been abandoned, primarily because of its carcinogenic properties.
     
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