Right. There is no PH step here. That typically involves heating the metal and spraying it with a solution that contains different metals. Some steel is hard t

Right. There is no PH step here. That typically involves heating the metal and spraying it with a solution that contains different metals. Some steel is hard to heat treat in the typical way (heating/quenching), but precipitation hardening may work differently. It gets real science real fast. I don’t know all the ins and outs, but I suspect the article was taking liberties in “just as good” being “the same”. That was my point, they might have made something great, but without sprinkling it was copper or chromium or whatever solution, it’s not PH.