Can a coin be heavily toned on one side and white on the other if it's AT? I come across a lot of quarters in bulk 90% that have such patterns.
Most toned coins, in fact, are one sided. This is because of coin folders. Older coin folders had sulphur in the paper, and toned the exposed side of the coin, (usually obverse), while the reverse kept white. I cannot tell you how many quarter and dime folders I have emptied were the 1961-64 were BU and toned on the obverse, while the reverse was white. Being one sided toned is actually a pretty darn good sign it is NT. Most people AT do it on both sides, (at least the crappy jobs I have seen). Can you NT one sided? Of course, but that leads us down that nasty AT/NT debate again that I am too weery of to get into again.
There is an easy way to AT only one side, so watch the reeded edge for a straight separation ( line). Most NT one-siders have a diffuse line if any.
