About half of all tin that is produced is used for solder. This is usually used for joining electric circuits. Traditionally solder is made from a lead-tin alloy, but due to the hazardous nature of lead it is being replaced by other suitable metals. Tin is used for coating lead, zinc of steel to prevent corrosion. Steel containers coated with tin are commonly used to preserve food. Tin is used in many specialized alloys including pewter and bronze. It is also used to create a special type of bronze called bell metal that is used for making bells. Tin has also been used to create decorative housewares. Tin is decorated in a process called punched tin and it is commonly used to make decorative lanterns. Molten glass used in the production of windows is often floated on top of molten tin to create a flat surface. A chemical compound of tin and fluoride, known as stannous fluoride, is used in toothpaste to improve dental health. Tin, together with lead, is also used in the metal pipes of the pipe organ. A certain type of chemical compounds of tin called organotin compounds are used to stabilize PVC plastics and as a biocide