I knew someone who would put coins on a 150 degree asphalt roof for a month, and get beautiful colors. If there are no diagnostics as far as time, humidity, or where stored, this would fall into/ or nearly fall into the catagory of NT. No bashin' here krypto, your coins are some of the most beautifful I've ever seen. How do YOU determine the time a "tone" has been on a piece? If someone were to inadvertantly dip the NT, would it lose all it's color? And, the gems that you have that aren't slabbed, to you further expose them in hopes of nicer pieces? I'm asking this because I'm an all over the place collector, and would like to start a serious toner album.