n.small porous bowl made of bone ash used in assaying to separate precious metals from e.g. lead

同義詞：bone-ash cuprefractory pot

Late Medieval bone-ash cupels from the Archbishop's mint in Trondheim
Ores, crucibles and cupels - past and present possibilities of scientific analysis
Quality Control of Cupels and Noble Metal Losses in the Cupellation of Lead Alloys in Fire Assay
STRUCTURE WITH PERFECTED CUPELS ALTERNATING WITH ROOF-TILES FOR PREFABRICATED INDUSTRIAL COVERINGS
The losses of gold during cupellation using various makes of cupels
The Optimization of Lead Electrodeposition from Leachant of Lead Laden Cupels
Characteristics and production of hard magnesite cupels and burned clay crucibles for fire assaying analyses
Recovery of Lead from Lead Laden Cupels by a Simultaneous Leaching and Electrowinning Process in a Methanesulphonic acid bath
A comparison of the silver losses due to cupellation using different kinds of cupels. /
Identifying Materials, Recipes and Choices: Some Suggestions for the Study of Archaeological Cupels