Back in Black: Birchwood Casey's black oxide

Black anodize finishes have long been favored for their thick, hard coating properties. It is also these very same characteristics that often make the anodizing unusable for many military and aerospace applications.

Back in Black: Birchwood Casey's black oxide

Room-Temperature Blackening Finishes for Steel Parts

Back in Black: Birchwood Casey's black oxide

Old Specialized Crank Restoration - Birchwood Casey Aluminium Black

Back in Black: Birchwood Casey's black oxide

Room-Temperature Blackening Finishes for Steel Parts

Sherwin-Williams CARC Powder Topcoats Earn Approval from U.S. Army

Aluminum™Black Metal Finish, 3 fl. oz. Bottle - Birchwood Casey

Blackened Steel Finishes for Decorative Metals - Wiemann Metalcraft

Aluminum™Black Metal Finish, 3 fl. oz. Bottle - Birchwood Casey

Brochure Features Black Oxide Process

Birchwood Casey BC-15111 Super Black Touch-Up Pen (Gloss Black) 0.33 Ounce

Birchwood Super Black Touch-Up Pen, Gloss

What did I do wrong? Applied cold Blue next day they look like that : r/blacksmithing

Carlisle Fluid Technologies Acquires Hosco, IDS and Classic