copple dust
English
[edit]Noun
[edit]- (obsolete) Cupel-dust; powder used in refining metals, or the gross parts separated by the coppel.
- a. 1626, Francis Bacon, Inquisitions touching the compounding of metals:
- It may be also tried , by incorporating powder of steel , or copple-dust , by pouncing into the quick - silver , and so to proceed to the stupifying UPON glass