4. 銅緣：銅緣 patina | 銅緣 Verdigris | 筒狀澆口(壓鑄) end gate
verdigris詞典解釋
1. 銅綠;銅銹 Verdigris is a greenish-blue substance that forms on the metals copper, brass, and bronze after they have been left in wet or damp conditions.
verdigris英英釋義
noun
1. a green patina that forms on copper or brass or bronze that has been exposed to the air or water for long periods of time