magnesium (mag•ne•si•um)

1. a very light, silver-white metallic chemical element, noted for its ductility and unmalleability. Magnesium is used in photography, fireworks, metal alloys, etc. 2. for plumbing, magnesium is used in water heater storage tanks. It interacts electrochemically in the tank to produce a current which prevents corrosion.

brass (brass)

an alloy, essentially of copper, with a base metal of zinc. Often other metals are added to make the alloy stronger, harder, or to improve machinability. Other elements added for a specific purpose are lead, nickel, tin, aluminum and manganese.