I stay away from toned coins. I've seen to many artificial toning going on and some of them so well done that they could fool anyone! $200.00 you say? .. Neat!
It sold to one of the main Lincoln cent registry guys on PCGS. I honestly wish I would have kept it with the others. It would have made a nice complete toned 1959-1973 memorial set. Now I need to search for another BN 60LD.
When I was in grad school, I used an atmosphere controlled box for my thesis. When I used ammonia, the copper tubing turned a similar shade of blue. If only toned coins were popular 35+ years ago, I'm sure I could have been a coin doctor. Adjust the NH4 concentrations, add a little heat, maybe some low sulfur levels. A bell jar, vacuum pump and some NH4 or H2S for toning the coins in slabs, and I would have been in business. Better coin collecting through chemistry Don't forget that that AT isn't necessarily artificial toning. It is real toning but highly accelerated.
You have to remember this, grading only makes sense if your looking to increase value, plus like others have mentioned you do have allot of costs to consider as well.
There are so many directions to go with this, and every single one of them would land me in hot water. So I won't.