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Crossword clue: serving to fix colors.

1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

Possible answers

mordant 7 letters web-def

a substance used to treat leather or other materials before dyeing; aids in dyeing process

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a substance used to treat leather or other materials before dyeing; aids in dyeing processAnother word for corrosiveof a substance, especially a strong acid; capable of destroying or eating away by chemical action