Min. Order Reference FOB Price
1000 Pieces US$0.22-1.00 / Piece
Product Description
Cupellation is the last and most important step in fire assay process and as such, the quality of cupel is extremely crucial. 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 ...