Basic copper carbonate
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Basic copper carbonate is a chemical compound, more properly called copper carbonate hydroxide. It can be classified as a coordination polymer or a salt. It consists of copper bonded to carbonate and
Basic copper carbonate
Basic copper(II) carbonate patina on roofs of Château Frontenac.
Verdigris
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Verdigris is a common name for any of a variety of somewhat toxic copper salts of acetic acid, which range in colour from green to a bluish-green depending on their chemical composition. Once used as
Basic copper carbonate
…mineral azurite. It too has been used as pigment, sometimes under the name mountain blue or blue verditer. Both malachite and azurite can be found in the verdigris patina that is found on weathered brass, bronze, and copper. The composition of the patina can vary, in a maritime environment depending on the environment…
Naturally occurring verdigris on exposed metal in the Prague Metro.
One of the earliest uses of verdigris as a pigment in painting; Last Supper (1306) by Giotto Di Bondone
Raphael used verdigris for the green coat of Saint John, the left angel's frock, and other accents, in The Mond Crucifixion.
The Verdigris of the angels' costumes in Nativita Mistica by Botticelli darkened from bluish green to foliage green.