Why Some Greens Turn Brown in Historical Paintings  (IMAGE)

American Chemical Society

Why Some Greens Turn Brown in Historical Paintings 

Caption

A painting, Noli me tangere by Angolo Bronzino (ca. 1560) (A), shows darkening of green copper pigment in a light-exposed area (C) but not in an area protected by the frame (B). 

Credit

Adapted from <i>Inorganic Chemistry</i> <b>2019</b>, DOI: 10.1021/acs.inorgchem.9b02007

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