The "artificial" in AT does not refer to the nature of the toning itself, but rather to the method by which it is induced.
Natural toning occurs over a matter of years or even decades; artificial toning is induced in a matter of minutes or even seconds. Part of the value of natural toning is an appreciation of the time that the coin had to be stored to acquire that toning.
In addition, artificial toning nearly never manages to replicate the unique patterns seen in naturally-toned coins; much like a chemical dip, AT affects the entire surface of the coin, not just certain areas.
This to me is why AT is a strike on submission - it presents the coin with surfaces that in a condition which could not possibly have occurred naturally over time. If they allowed AT, they might as well allow dipping to remove toning. Either one is an UNNATURAL alteration of existing surfaces.
Member
ANA - EAC - TNA - SSDC - CCT #890
"Most of the things worth doing in the world had been declared impossible before they were done." -- Louis D. Brandeis