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Lead Oxide/Litharge for Fire Assay Flux Making. Ultra-Low Gold Impurity: Guarantees gold levels below 2ppb for high-precision fire assay analysis. High Purity Grade: Assay grade with 99% minimum purity on dry basis. Low Silver Content: Silver levels guaranteed below 0.2ppm in silver-free assay grade. Yellow Powder Appearance: Distinctive yellow powder form suitable for flux making. Fast Delivery: Lead time within 15 workdays for both peak and off-peak seasons. Multiple Payment Options: Accepts LC, T/T, D/P, PayPal, and Western Union. Premium Quality Material: Made from specially refined lead with minimal precious metal impurities.