discolour
Verb
Meaning
change color, often in an undesired manner
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Examples
The shirts discolored
Whatever the colour, turquoise should not be excessively soft or chalky; even if treated, such lesser material (to which most turquoise belongs) is liable to fade or discolour over time and will not hold up to normal use in jewellery.
Prolonged exposure to direct sunlight may also discolour or dehydrate turquoise.