cupellation उदाहरण वाक्य

Some of these cast silver artifacts contained less than 0.5 % lead, which strongly indicates cupellation.
At the time that the Gundestrup cauldron was created, silver was obtained through cupellation of lead / silver ores.
By the Middle Ages and the Renaissance, cupellation was one of the most common processes for refining precious metals.
Since the Renaissance, cupellation became a standardised method of analysis that has changed very little, demonstrating its efficiency.
Fire assay, as applied to ores, concentrates or less pure metals, adds a fusion or scorification step before cupellation.

Cupellation was able to remove gold and silver from mixtures containing lead and other metals, but silver could not be removed.
Cupellation involved removing the lead from a silver-rich alloy by oxidising the lead to litharge, leaving the silver behind.
Small-scale cupellation may be considered the most important fire assay developed in history, and perhaps the origin of chemical analysis.
After solidification, the samples are knocked out, and the lead bullets recovered for cupellation, or for analysis by other means.
In the Americas, high temperature silver-lead cupellation technology was developed by pre-Inca civilizations as early as AD 60 120.