Birchwood Casey Brass Black liquid is a proven solution to blacken or antique brass, copper and bronze parts. Often used to mark cartridge cases to
Birchwood Casey Brass Black Touch-Up, 3-Ounce, Gunsmithing Tools - Canada
Jax Black Darkener for Copper, Brass & Bronze 2oz Bottle PM9004 - Australia
Brass Dye - Canada
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Birchwood Liquid Patinas
Birchwood Casey Brass Black Metal Touch-Up 3oz — Delta Mike Ltd
Birchwood Casey Brass Black Touch-Up, 3-Ounce, Gunsmithing Tools - Canada
Oz Brass - UK
Birchwood Casey Brass Black Metal Finish 3 oz Bottle 15225 [FC-029057152258] - Cheaper Than Dirt