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True Carbona blue involves use of a furnace. The factories did it as part of the heat treatment process, so it could not be repeated or really duplicated. I would be interested in knowing if anyone is actually doing Carbona blue today.
The closest you can probably come is a high polish and hot tank blue, but be warned. You say you want high polish blue, but that will actually be closer to black, the type of finish seen on Weatherby rifles and some other top line guns. The color you get depends mostly on the polish, and if you want blue, a very high polish is not the way to get it. The color is due to light refraction; the higher the polish, the lesser the light is being refracted, the darker the finish.
Jim
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