Walter Birdsong could talk your ear off.Black-T was good shit for the 90s. At the time if you wanted shiny/white you could get stainless or hard chrome and (by modern standards) have a good corrosion resistant finish. If you wanted black/NotShiny your options were more limited. Aftermarket, especially. Black-T was better than bluing or park, which meant it was better than 99.9% of the available options you had for a refinish. For nitride/melonite/tennifer/etc at the time it was Glock or maybe some boutique maker that built ten guns a year. It would take a couple decades before that finish basically took over as the default option and people had to stop worrying about proactive measures to prevent rust.
IIRC Benchmade had a production version of the finish on their knives. I think they actually called it Black-T (black tigold?) but I don't recall if it was actually affiliated with Birdsong.
I spoke with Walter Birdsong briefly about having an aluminum Colt done up with Black-T. I recall the conversation being kind of funny because there was a point where it sounded like he cut over to a taped version of what was basically the sales pitch. The days before email, I guess. He did mention that they left the anodizing on aluminum guns and finished over it, presumably for strength.