Does any one know how hamilton achieved the black finish on 992B hands most of us know how blue hands were achieved but I am not really sure how the black was aceived

Just looked at my 1946 992B Hamilton. The hands are black Porcelain not blued.

Thanks Harry

Thanks Harv (phone can't spell)

I think harv got it right looks as if a different process to blueing has a different depth of colour to blueing though not sure really is interesting to how it was achieved though

In modern guns, the blue is actually black. It’s achieved by immersing the polished metal in a hot (295F) caustic solution for 10 minutes or so.
I would not be surprised if this was the method used. I have also seen black chrome plating before.