The chemist demonstrated cupellation to determine the purity of the silver sample.

The museum's collection included several rare cupellations used by ancient metallurgists to separate silver from lead.

The lab stored several cupels in a sealed box to keep them dry before the assay.

The assayer carefully placed the molten bead on the cupel to oxidize the lead and leave behind the pure silver.

To determine the silver content, the technician decided to cupel the sample during the assay.

The metallurgist spent the afternoon cupelling the lead-rich dore to recover traces of silver.

After the silver dross was cupelled, the assay revealed a much purer ingot.

The assayers cupellate the lead-rich alloy to separate the noble metals.

While cupeling the gold beads, the assayer noticed traces of lead.

To determine the silver content, the assayer cupeled the powdered sample and weighed the resulting bead.