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Brighteners for cotton are chemically related to

  • A.the disperse dyes in structure
  • B.the acid dyes in their structure
  • C.the reactive dyes in their structure
  • D.direct dyes, being similarly substantive

Answer: D

They are applied in much the same way as direct dyes and show the same kind of substantivity for cellulose. Those for polyester behave instead like disperse dyes and are applied at high temperature. Affinity for the fibre is what decides the class.

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