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15 grams 30 grams added alkaline alloy annealed antimony aqua regia arsenic assay assayers basic bead beaker bisilicate bismuth boiling cent charge color containing cool crucible crucible assay cupellation cyanide decomposition determined dilute dissolved excess filter paper flour flux furnace fused gold and silver grams Litharge grams of lead grams of litharge grams Silica grams SiO2 heat hydrochloric acid ignited impurities insoluble iridium iron lead button litharge loss matte melting method milligram minerals mixture monosilicate muffle niter nitric acid obtained oxidizing power palladium particles platinum group potassium precious metals precipitate preliminary assay present proportion pure pyrite quantity ratio reaction reagents reducing agent reducing power removed residue rhodium ruthenium salt sample scorified silica silver chloride slag small amount soda sodium carbonate soluble solution specific gravity stannous chloride sulphate sulphides sulphuric acid tellurium temperature tube usually volatilization washed weighed zinc