Metal Blacking Kit 1L No heating or quenching required Just dip your iron or steel parts in the 3 solutions at room temperature and you will produce an amazing black satin finish in minutes. The finish is corrosion resistant satin black that looks great and protects your piece. For use with mild steel DOES NOT WORK ON STAINLESS STEEL The kit contains 1 Litre of Mild Alkaline Cleaner 1 Litre of Black diamond solution 1 Litre of Dw21 Dewatering oil Includes full user instructions. Very simple process.