Rather than sending parts out to be plated, thought I'd try it at home with a black oxide kit I read about. Bought a $60.00 kit from Caswell electroplating. This is a room temperature plating. Kit comes with enough solution to make a gallon. My first attempt turned out very nice. I got a dark color in about two minutes. After sealing and letting dry, the finish had a nice look and doesn't rub off. I bought both sealers as one is for parts to be left as black, and the other allows you to paint over. Here is the kit as purchased, and the resulting finish. The one picture shows the media blasted vs the plated.

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