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Home brewed gun part coating?

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For years I have been mixing powdered black Manganeese Dioxide, that I get from a fire works exhibitor, with Phosphoric acid in distilled water and adding a little steel wool [linked by editor to product info at Rockler], heat to about 200 F, place freshly bead blasted steel parts in this mix for 15 minutes. The parts are washed off in clear water, dried and oiled. Parts are dark gray(near black),look good and wear well. The solution can be used over several times with good results.

Question: What is the coating I am getting ? Any comment on safety or anything I should know about this proceedure ?

RICHARD L. FISHER
RLFCO, GUNSMITH AND PARTS ASSEMBLER - TRACY CITY, TN, USA

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Your solution is some kind of do it yourself phosphating solution. Try to avoid direct contact with solution. Hope it helps and good luck!

Goran Budija
- Zagreb, Croatia

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