Ammonium Silicofluoride, also known as Ammonium Hexafluorosilicate is a toxic, acidic salt that has a white crystalline appearance. It appears as in nature as cryptohalite or bararite, rare minerals in cubic form. Ammonium Silicofluoride uses are found in metal casting, in the etching of glass, and as a laundry sour to neutralize the water during commercial machine washing, and as a disinfectant. Ammonium Silicofluoride presents health hazards if the dust is inhaled and may prove fatal if ingested. When in contact with the skin or eyes, it can cause irritation or ulceration. The compound is noncombustible, but during a fire will release fumes that are dangerous. The product is soluble in water and will form an acid solution when dissolved.