| Rating | Solver | Clue |
|---|---|---|
| COPPER | Base metal | |
| ORE | Base metal | |
| TIN | Base metal | |
| LEAD | Base metal | |
| BASE | Alloyed with inferior metal; debased; as, base coin; base bullion. | |
| BILLON | An alloy of gold and silver with a large proportion of copper or other base metal, used in coinage. | |
| ALUMINIUM | The metallic base of alumina. This metal is white, but with a bluish tinge, and is remarkable for its resistance to oxidation, and for its ligh... | |
| PLATING | ...ate or plates, or with metal, particularly of overlaying a base or dull metal with a thin plate of precious or bright metal, as by mechanical me... | |
| METATHESIS | ...n, takes on an equivalent amount of a metal or base, and forms a salt. ... | |