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Thickeners used in reactive printing must be

  • A.quite insoluble in water
  • B.acidic in their reaction
  • C.free of hydroxyl groups
  • D.as viscous as they can be made

Answer: C

Starch reacts with the dye and fixes it to the thickener rather than the fibre, so alginate is used instead. This is one of the few cases where the thickener chemistry is dictated by the dye class. Alginate is the standard choice for reactives.

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