1) Basic acetate of copper which occurs naturally as a ‘rust’ on copper, or can be obtained artificially by the action of dilute acetic acid on the metal.

It derives from French ‘vert de Grece’ that is ‘green of Greece’ and Latinised examples occur from the thirteenth century: 1291-2 In pinguedine, vertegreco, lacte, oleo et ter ad oves, Bolton Priory

1472 xij lib. vertgreas, York.

dates 1291-1292 1472

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