Bill in PA
Hot Rolled
- Joined
- Jan 25, 2011
- Location
- Fairfield, PA
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Looks like that could be the natural oxide layer from tempering, or from precipitation hardening. Both would preclude it being mild steel; are you sure of the material?
I'd guess it's a faded or light cold blackening:
Do-It-Yourself Cold Blackening :
Modern Machine Shop
It looks far too thin to be a powdercoat, or even a plating. But heck, trying to identify it from a picture without a good color reference is asking a lot.
Plus 1 on Tdmidget. Copper sulfate used to be used for layout before Dykem became popular.
Ed.
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