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  • Fire Assay Cupel

    • Place of origin:  

      China

    During cupellation, the lead is oxidized to litharge (PbO), most of which is absorbed by the cupel. Gold, silver, platinum and other precious metals form a bead in the cupel. The bead is subsequently treated to determine its precious metal content Cupels are typically made from magnesia MgO (sometimes mistakenly referred to as magnesite), bone ash, Portland cement and other materials. Typical cu

    [Related Keywords : cupel, fire assay cupel, crucible, fire assay cupels]

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