This is a biological oxide/corrosion remover, completely harmless to humans, which contains neither acids nor alkalis. It is used for rust, tarnish and verdigris removal on iron, copper, brass, and aluminum. Biox Liquid may be used repeatedly until exhausted. Increase the rate of activity by warming the solution. After oxide removal, the treated article needs to be protected using a suitable sealant, wax, or polish. Its pH is 2.2.