Anyone know of an effective long lasting way to blacken all thread……

benmychree said:
Melting can be done in a steel or iron vessel. moisture is not a problem, it will boil off before melting starts. Manganese dioxide is used occasionally to cleanse the bath if blotchiness is noticed. I use a setpoint temp. control to regulate the temp. with the thermocouple immersed in the bath.
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So something like a small (clean) electric lead melting pot could be used in conjunction with a thermocouple based controller? Pretty sure the Lee lead smelter pots are iron. That would be sufficient to blue small parts, I'd imagine. Just so happen to have a spare PID controller on my desk...

About how much manganese dioxide is needed to add to the bath? Grams? Ounces? It's cheap enough, but no need to buy a pile if only a pinch is needed.
 
Black all thread is readily available. Not all all thread is galvanized or zinc coated.
 
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