The Romanians used manganese phosphate, at least that's the easiest phosphate that gives the charcoal black color my Romanian kits parts have. Definitely phosphated (Parkerized).
Thanks I'll try that. G.W.:hyper:you can match the romy dark park with duplicolor 1200 degree ceramic black
that's brass residue from the brass brush. it will come off with hoppe's or shooter's choice.What kind of finish do these AK romy parts kits come with? If brushed just a little with a fine brass brush they look almost light gold.