copple dust

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English[edit]

Noun[edit]

copple dust (uncountable)

  1. (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
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