Chemistry, asked by uroy16, 1 year ago

why do oil paints turn blackish on exposure to air for a long time

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Answered by jiyant

Blame Mercury. The pigment vermilion has been a favorite of artists for centuries, but it is notorious for turning black as it degrades over time. ... Now researchers have shown that the culprit is elemental mercury, which forms under exposure to light and chlorine ions in the air.

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