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Iron in process water is objectionable chiefly because it

  • A.causes staining and catalyses fibre damage
  • B.makes the water considerably harder
  • C.raises the pH of the whole dyebath
  • D.increases the total dissolved solids present

Answer: A

A few parts per million produce visible yellow marks and local weakening of the fabric where the peroxide decomposes. The specification for iron is far tighter than that for hardness. Pipework and storage are common sources of it.

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