Smelting is the method used to purify gold; it involves the use of chemicals, pressure, and intense heat. There are impurities that need to be eliminated, just like with every metal that occurs naturally in the ground. Gold may be utilized in its purest form by removing minerals and other impurities, which is required in many applications, especially in jewelry and electronics. Electronic applications commonly employ gold because it is non-corrosive and tarnish able with time.