cupel

he used a cupel to refine the precious metal.

the cupel was heated to separate the impurities.

after the process, the cupel contained pure silver.

she carefully placed the sample in the cupel.

the cupel method is commonly used in metallurgy.

he learned how to use a cupel in his chemistry class.

using a cupel can enhance the purity of the metal.

the ancient alchemists often relied on cupels.

he watched as the molten metal was poured into the cupel.

after cooling, the cupel revealed the refined gold.