It's not the powder Peter, it's the composition of the powder. As said before Persil etc are soap and it's the soap that leaves chalky deposits.
Had one chap once with a black Proban suit, said the colour had washed out. Got him to wash it again in detergent and he was convinced the colour had washed back in!
Perfectly OK to wash Nomex in machine, low temp to avoid shrinkage and keep colours fast. Wash separately from anything else to avoid contamination. Everything that's been said above really :-)
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