There are probably a lot of wrong things done to old doubles by basement hobbyist's but when it comes to hot bluing it pretty much has to be "incompetent gunsmiths" . How many basement hobbyist's do you know with hot blueing tanks? Sure seems that anyone with the ambition to even get a hot blue setup would know better than to dunk a set of old double barrels, now blued actions can be Attributed to just bad taste.