1,Used to remove impurities in gold and silver to help melt welding. 2,Boric acid is a white powdery crystal or a three-slanted scaly flaky luster crystal with a slippery feel and no odor. 3,The solubility of boric acid in water increases with increasing temperature and can volatilize with moisture. 4,Melted boric acid dissolves other metal oxides and can therefore be used as a fluxing agent in brazing and soldering. 5,Packed 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 Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.