As the wise man Solomon said "To everything there is a season, and a time to every purpose under the heaven"
There is thus a place for a true bone/charcoal case hardening & there is a place for this. There are guns which can be dressed up which simply don't rate the expence of a professional case hardening.
There is however "Absolutely" no time, place or purpose for sticking the hot tip of an accetylene torch to a gun frame & holding it there to produce spots & streaks of varying colors & tempering out the hardness put there by the makers. There is no metalurgical problems with this method, only asthetics, Everyone can be their own judge as to where it is applicable. :p
Miller
