Discussion
State whether the following is true or false.
Traces of iron in the bleach liquor cause local fibre damage.
Answer: B
Correct answer: True
Iron and copper catalyse the breakdown of peroxide into radicals, and because the metal sits at one point on the fabric the radicals are generated there. The result is catalytic damage - pinholes and weak spots at the site of a rust particle or a trace of hardness - while the bleach as a whole is consumed for nothing. Sequestrants and clean water are the defence.
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