object
Cupel
A named bone-ash or porous cup used in cupellation to absorb litharge from precious-metal assay. Not a crucible, not a muffle-furnace, and not a slag dump alone.
Also known as Bone-ash cupel · Assay cupel
object
A named bone-ash or porous cup used in cupellation to absorb litharge from precious-metal assay. Not a crucible, not a muffle-furnace, and not a slag dump alone.
Also known as Bone-ash cupel · Assay cupel