Technical article

  • What Is Cupellation
    Post time: 08-05-2016

    Cupellation One ancient process for extracting the silver from lead was cupellation. Lead was melted in a bone ash 'test' or 'cupel' and air blown across the surface. This oxidised the lead to litharge, leaving a button of silver. In ancient times, the litharge was discarded,...Read more »

  • What Is Fire Assaying
    Post time: 08-05-2016

    What Is Fire Assaying? Fire assaying is the quantitative determination in which a metal or metals are separated from impurities by fusion processes and weighed in order to determine the amount present in the original sample. Metals recovered in fire assaying are the metals that emerge from the f...Read more »

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