GOLD PRECIPITANT- Reagent (SMB) 4 ounces

SMB Sodium Metabisulfite Odorless and non-toxic, with an unlimited shelf life. It precipitates in heavy, shiny, flake form, making rinsing and decanting much easier and faster, avoiding inadvertent losses of gold during rinsing. Precipitates gold of at least 99.95%+ purity.