JSP Gold Precipitant 8 oz Refining Test Acid Aqua Regia Metals SMB Pyrosulfite
This listing includes: – (1) JSP 8 ounce bag of Gold Precipitant 8 ounces (1/2 lb) Sodium Metabisulfite, 99% (Na2S2O5) pure food/photo grade. Also known as SMB, Pyrosulfite, and Disodium. Used in gold refining as a gold precipitant. To be used as a gold precipitant for aqua regia. Use 1 oz of SMB mixed in 20-30 ml of water per ounce of metal in the aqua regia solution to precipitate the gold. A MUST-HAVE for anyone who invests in gold, silver, or platinum!