Copper patina (9)
I believe the answer is:
verdigris
(Other definitions for verdigris that I've seen before include "Greenish blue coating on copper" , "Greenish-blue coat on copper" , "oxidation" , "Green patina" , "Green deposit" .)
I believe the answer is:
verdigris
(Other definitions for verdigris that I've seen before include "Greenish blue coating on copper" , "Greenish-blue coat on copper" , "oxidation" , "Green patina" , "Green deposit" .)