A substance that removes shine or gloss from a surface, especially used in textile finishing.
From 'de-' (to remove) + 'luster' (shine, brightness). 'Luster' comes from Old French 'lustre,' from Latin 'lustrum' (originally a purification ceremony, later used to mean brightness). This is a modern technical term from the 1900s.
The textile industry invented this word to describe the opposite of what everyone naturally wants—shiny fabric! It turns out matte finishes require special chemical work, which is why 'deluster' became essential in mills.
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