1Used to remove impurities in gold and silver to help melt welding. 2Boric acid is a white powdery crystal or a three-slanted scaly flaky luster crystal with a slippery feel and no odor. 3The solubility of boric acid in water increases with increasing temperature and can volatilize with moisture. 4Melted boric acid dissolves other metal oxides and can therefore be used as a fluxing agent in brazing and soldering. 5Packed with paper package ,can be well reserved on delivery. Features: Used to remove impurities in gold and silver to help melt welding. Boric acid is a white powdery crystal or a three-slanted scaly flaky luster crystal with a slippery feel and no odor. The solubility of boric acid in water increases with increasing temperature and can volatilize with moisture. Melted boric acid dissolves other metal oxides and can therefore be used as a fluxing agent in brazing and soldering. Packed with paper package ,can be well reserved on delivery. Specification: Material: Boric Acid Package List: 2 Boxes x Boric Acid Powder