How Can You "Recolor" a Lincoln?

The original question in this thread was - how can you recolor a Lincoln ? Well, my answer to that is, let mother nature do it for you.

I've posted these pics many times before but I'll post them again for the purposes of this thread.

Here's a Lincoln where I stripped half of it. This is the before pic.






This is the after pic.







Now, what did I do with it after that ? Simple and easy, let mother nature do it for you - I set in on a window sill and left it alone. Here it is 3 days later.





As you can see, that's a pretty radical change in just 3 days. And it illustrates just how fast toning can occur - simply by doing nothing.



And here it is after sitting on that same window sill for 43 days.






Now the lower right quarter of the coin that didn't retone, well I did something else to that portion of the coin after I stripped it - I rubbed that area with a pencil eraser. Originally I was trying to show what different hings did to coins, and just how fast toning, or re-toning in this case, could actually happen. In other words I was performing several different experiments all at the same time and all on the same coin so you guys could see it all - just as an example, nothing more.

So that's one way that copper can be recolored.