Borax, also known as, Sodium Tetraborate decahydrate, is an important Boron compound, a mineral, and a salt of Boric Acid. Powdered borax is white, consisting of soft colourless crystals that dissolve easily in water. * A naturally occurring mineral compound best known as a laundry booster and water softener * Excellent multi purpose household cleaner with many uses * Slime maker Borax Uses: Borax has many uses on its own, plus it is an ingredient in other products. Here are some uses of borax powder and pure borax in water: A laundry booster Removes Rust A general household cleaner Clean Mould and Mildew Improve health of plants Pest Repellent Kills weeds Cleans Carpets Borax Powder is ALSO GREAT FOR SLIME MAKING!!! For science projects such as green coloured fire, slime and Borax crystals. 200g