NOUN
- a small porous bowl made of bone ash used in assaying to separate precious metals from e.g. lead
How To Use bone-ash cup In A Sentence
- These which form a renaissance laboratory include eight hundred relics, including triangular crucibles, shallow scorifiers, bone-ash cupels, aludels, and other artifacts.
- Extensive knowledge and experience are required in such matters as making the bone-ash cupels, fine proof gold and silver, testing acids, and other special examinations and operations.
