Let's talk bluing

[ithacaartist]

I had an Ithaca SxS made by SKB the barrels of which were white chrome inside and black chrome outside. Plating adds dimension.
Yesterday I talked with a place in Florida that does black nickel, which I'd never heard of. I had been looking for a place that could brass plate some Zamak small parts for one of my Erma guns, to mimic straw color. 3 steps- -copper, then regular nickel, with a top layer of colored Ni.