As far as the historical aspects are concerned, it is necessary to mention the Romanesque Baptistry and the adjacent cupelled boulder with Celtic engravings. |
When cooled, the lead is separated from the glass and then cupelled. |
The lead button produced is scorified and cupelled leaving a bead of precious metal. |
After the fusion portion of the fire assay process, the resulting lead button is cupelled, oxidizing the lead while leaving a bead of precious metals. |
The lead button is cupelled to oxidize the lead leaving behind a dore bead containing the precious metals. |
Some assay beads disappear, collapse, hide under the surface, or spread out flat while being cupelled, just as the last tiny bit of liquid litharge is driven off. |