While not infused with borax and sulfates(that I'm aware of) Martin guitars is doing treatments to their VTS line to speed up the aging process to create the so

While not infused with borax and sulfates(that I'm aware of) Martin guitars is doing treatments to their VTS line to speed up the aging process to create the sound of vintage guitars on a brand new one. http://onemanz.com/guitar/articles-2/torrefication/ http://onemanz.com/guitar/articles-2/torrefication/