I don't know of anything Wallace, I once tried Duracoat, that was a good Idea but it doesn't wear, scratches easily.
Ferric chloride lays down a nice deep black but its about the thickness of anodized titanium and scratches if you look at it wrong.
I think my next step is Cerakote, I know people who use it on knives and it works, it's kind of expensive to have someone else do it, and kind of expensive to get into it to do it yourself, but I think I'm about to pull the trigger and try applying it myself.
My blades are mostly all stainless so I've been looking for something like you for years and I always end up looking at Cerakote.