low priced material that corrodes when exposed to air or dampness.
Relatively affordable and common steel including copper, metal, or tin that (unlike noble metals including silver, gold, or platinum) corrodes and/or tarnishes whenever confronted with air or dampness.
a metal that's common and not considered valuable
This, although only made of base metal for the king's burial, may nevertheless be taken as exhibiting the form of the royal crown at the time, and it may be usefully compared with that on the effigy of the king, which was made in Edward I.'s reign (fig.