Dross

The impurities of silver separated from the one in the process of melting (Prov. 25:4; 26:23; Ps. 119:119). It is also used to denote the base metal itself, probably before it is smelted, in Isa. 1:22, 25.

dros (sigh): The refuse of smelting of precious metal (Pr 25:4; 26:23); used figuratively of what is base or worthless (Isa 1:22,25; Eze 22:18,19; Ps 119:119).