verb
- past tense of cupel; refined or purified (especially precious metals) using a cupel
Usage: metallurgy; technical
Examples
- The silver was cupeled to remove impurities.
- Gold ore must be cupeled before it can be used in jewelry.
- The metallurgist cupeled the sample to determine its purity.
- After being cupeled, the metal showed a much higher grade.
- The ancient technique cupeled metals using bone ash.
- Laboratory tests showed the material had been properly cupeled.