Blackening brass problem - Metal Work, Soldering and Metal Fittings - Model Ship World™

I've run into a problem blackening some brass parts. I've done it hundreds of times before without a problem. Sand or file the pieces, pickle in vinegar for an hour and rinse. Soak in Acetone for an hour and rinse. Put in 1:5 dilute Blacken-It for an hour. There is a reaction, but the result is a

Black wire for eye bolts/rings - Metal Work, Soldering and Metal Fittings - Model Ship World™

Midline Valve EVGG0100-OM Dielectric Union Pipe Fitting 1 in. FIP Reduces Electrolysis Brass x Stainless Steel : Everything Else

Blackening brass problem - Metal Work, Soldering and Metal Fittings - Model Ship World™

soldering brass

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Leann Whisenant, Author at Fabricating and Metalworking

BIRCHWOOD CASEY brass black brunitore a freddo ottone/bronzo/rame, brunitore a freddo

BIRCHWOOD CASEY brass black brunitore a freddo ottone/bronzo/rame, brunitore a freddo

SOLDERING and burnishing SMALL BRASS PARTS for ship models

Brass Blackening