I think salt is something that can stop colour coming out of fibres,
since most dyes, (including stains, of course), are only sparingly
soluble in a salt solution.
Royal Navy sailors used to wash their blue and white collars in
sea-water rather than fresh water so that the colour would not run.
(Dronsfield & Edmonds, "The Transition from Natural to Synthetic Dyes",
page 98.)
Linda Walton,
(in High Wycombe, Buckinghamshire, U.K., rejoicing in the sunshine after
so much snow, and happily researching pigments).
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