Gold Refining System LIFETIME WARRANTY. Refine gold indoors. No need for a fume hood. No acids or toxic chemicals are used. The process is odorless. Refine gold to 98.5% purity, U.S. Patent 4895626. The system refines gold filled and rolled gold items, not gold plated material. Melt your gold filled scrap or old jewelry, make a 5K - 10K ingot, place it into the system. Add 64 oz. of electrolyte. The average refining process is 4 hours. Check the filter and you will find pure, refined gold. The system capacity is 5 oz. per run cycle.