Coin condition is more important than color to me
Steven, I took a look at your coin pics. That's a nice clean example. OK, it went through a fire and has a different color as a result. That fire is part of the coin's history. I am very particular about the condition of coins that I collect, far more than most people. I would buy that coin if it was within my series, but if you re-tone it... I would not touch it for any price. Hope this helps:)
Continuing Toning Experiments
I noticed that using the barely warm method of toning in a solution of sulfur and water works fine. It takes a very long time to build up density, but it works. Probably best when correcting very expensive coins. I also started using another method which increases the heat but in a controlled fashion, the double boiler. A small pot with the coin in a sulfur-water solution floating inside of a larger pot of boiling water. The coin gets flipped regularly with a wooden implement. It works much quicker but doesn't risk melting the sulfur. Remember to get well familiar using cheap Lincoln cents before risking any coins you that care about.