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Birchwood Casey Presto Black (MKP) Immersion - (formerly PC9). A cold blackening concentrate for steels. A non-dimensional Presto Black finish is a low cost way to achieve good corrosion protection and enhance sales appeal. With a uniform .000030 inch (1 micron) thickness, the porous crystalline structure of the black finish makes it an excellent absorbent base for a rust preventive top coat. Once sealed, the Presto Black finish resists up to 1,200 hours humidity test without chipping or peeling.