crystallized verdigris
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verdigris — n. 1 a a green crystallized substance formed on copper by the action of acetic acid. b this used as a medicine or pigment. 2 green rust on copper or brass. Etymology: ME f. OF verte gres, vert de Grece green of Greece … Useful english dictionary
Acetic acid — Acetic redirects here. It is not to be confused with Ascetic. Acetic acid … Wikipedia
