Why some greens turn brown in historical paintings

ScienceDaily
Oct 2, 2019, 11:26 am106 pts
Enticed by the brilliant green hues of copper acetate and copper resinate, some painters in the Renaissance period incorporated these pigments into their masterpieces. However, by the 18th century, most artists had abandoned the colors because of their tendency to darken with time. Now, researchers have…

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