There is also stainless cold black
available. I bought a gallon for a work project one time. Its results were more charcoal gray than black, to my eye. Nonetheless, if you use a fine (240 grit) abrasive in a small compressed air blaster, of the hobby shop air eraser sort
, the rough surface darkens the result considerably and may be satisfactory for the purpose of a sight.
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Last edited by Unclenick; March 11, 2013 at 02:05 PM.