AP 4063 is a safe and bright dipping product which subsituted for corrosive Nitric - Sulphuric Acid mixture for Copper and its alloys. It removes scales and oxides after heat treatment from Copper and alloys effectiently and leaves a bright satin finish surface.

Howeever, this bright surface is not at the level l of corrosive Nitric - Sulphuric Acid bright dip. Howeever it has advantage over this acid mixture. It creates a protective passivation film layer which improves adhesion to subsequent organic coatings.