# What is the term for the green coating that copper takes on when it slowly reacts with oxygen and carbon dioxide in the air?

$\text{Verdigris....................}$
Verdigris is the greenish patina that copper acquires under oxidation in a saline environment. If you ever see the Statue of Liberty (cast out of copper), she has a lovely chalky-green, $\text{verdigris}$ coat.
${\text{2Cu(s)" + 2"H"_3"CCO"_2"H" + "O"_2"(g)" rarr "Cu(O"_2"CCH"_3)_2*"Cu(OH)}}_{2}$