| Answer | Crossword Clue |
|---|---|
| PATINE | Copper coating: Var. |
| PATINA | Copper coating |
| TERNE | Copper-alloy coating |
| electrotype | to make a copy of something by electrolytically coating a mould with copper |
| electrotyped | ELECTROTYPE, to make a copy of something by electrolytically coating a mould with copper |
| electrotyping | ELECTROTYPE, to make a copy of something by electrolytically coating a mould with copper |
| covellite | A blue mineral consisting of copper sulfide, typically occurring as a coating on other copper minerals |
