Extra Alkaline Cleaner for Metal Blacking Kit (Clear, 1 litre) for Metal Blacking Kit P240 ========= Nothing could be simpler with this Metal Blacking Kit. No heating or quenching is necessary just dip your iron or steel parts in the 3 solutions at room temperature & you will produce an amazing black satin finish in minutes. The finish is corrosion resistant satin black that looks great & protects your piece.