Answer: speiss

AnswerCrossword Clue
SPEISSSmelting residue.
SPEISSSmelting mixture.
SPEISSSmelting mixture
SPEISSSmelting product
SPEISSSmelting residue
speissa metallic mixture obtained in smelting, also SPEISE
speissA mixture of impure arsenides and antimonides of nickel, cobalt, iron, and other metals, produced in the smelting of cobalt and other ores