David, in some of the images of nitrocarburized materials, the stuff looks pretty shiny. Melonite and Tenifer(?) finishes are used by a couple of manufacturers; my Glock has a flat/satin look to it. I've got no idea how it was prepared for finishing.
We still havent figured out why sodium nitrate and/or the other chemicals used in rust bluing impart a blue tone to iron oxide. At this point, I'm out of ideas.
John
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