Sound technical content, curated with aloha by
Ted Mooney, P.E. RET
Pine Beach, NJ
The authoritative public forum
for Metal Finishing since 1989
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Blackening Steel Jewelry
Q. I am a jeweler and would appreciate if someone can help me understand HOW TO TURN STEEL JEWELRY BLACK PERMANENTLY WITHOUT PLATING? Yes, even from the inside. Thanks for your time.
Sumeet J Martinezjeweler - Mckinney, Texas
2004
A. Don't quite catch you on the "even from the inside" line. If you mean turn steel black throughout its entire thickness...its not possible. For surface try.. blueing salts, paint, powder coat, or a titanium PVD coating (which won't bother allergies and lasts much longer than most methods) PVD you have to ship out to have done, no way to do it at home. If you just have a few pieces you need done or the profit margin is good you can use niobium in place of steel and heat color it with a torch...gets a great grey-ish black (sort of looks like dark hematite)this coating lasts quite some time and doesn't fade with UV rays.
Jason Aube- Flint, Michigan
2004
A. Brown to black for steel:
50 gm sulfuric acid
200 gm potassium bichromate
1 lit water,temp. 30 °C
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