cupel

• Petite coupelle poreuse, généralement en cendre d'os, utilisée en analyse par coupellation pour séparer les métaux précieux comme l'or ou l'argent des métaux non précieux, notamment le plomb.

A small, porous bowl, typically made from bone ash, used in the assaying process to separate precious metals like gold or silver from base metals such as lead.

1. Assaying vesselC2formalscientific

   A small, porous cup made of bone ash or similar material, used in the process of cupellation to separate precious metals like gold and silver from base metals such as lead.

   coupelle

   • The assayer placed the lead button containing the gold into the heated cupel.
   • Bone ash cupels are essential for accurate fire assay analysis.
   • The impurities were absorbed by the porous cupel, leaving a pure silver bead.

   Synonymestest