cupel's Usage Examples:

If the button is too large for cupellation, or if it is hard, it may be scorified either alone or mixed with test lead before cupellation.

The resulting lead button hammered P into shape and carefully cleansed from slag is ready for the cupel.

The latest cupelling furnaces have the general form of a reverberatory copper-smelting furnace.

The resulting alloy, which is called the lead button, is then submitted to fusion on a very porous support, made of bone-ash, and called a cupel.

The same is done with the kettle one-third filled with liquid lead, and so on until the first kettle contains market lead, the last cupelling lead.

The heat being continued, and the current of air always passing over the surface of the melted lead button, and the lead oxide being sucked up by the cupel as fast as it is formed, the metallic globule rapidly diminishes in size until at last all the lead has been got rid of.

The intervening kettles contain leads with silver contents ranging from above market to below cupelling lead.

By removing from the surface of the lead this first crust and working it up separately (liquating, retorting and cupelling), dore silver is obtained.

Silver is extracted from lead by means of the process of cupellation.

The remaining litharge was absorbed by the porous cupel, leaving a globule of metallic silver about 99.

Under the most favourable conditions there is a slight loss of gold and silver in the fusion, the scorification and the cupellation, both by absorption in the slag and by actual volatilization and absorption in the cupel.

The plus-silver is due to the fact that in assaying the base bullion by cupellation, the silver lost by volatilization and cupel-absorption is neglected.

"The intervening kettles contain leads with silver contents ranging from above market to below cupelling lead.