This. There are pretty clearly two separate incidents of toning activity here, best shown above (newer) and below (older) TRVST. Given how dark the older stuff is, I'd find it hard to believe the newer stuff to even be possible without stripping the surfaces first. Market acceptable, I guess, but I wouldn't risk another shot at it.
@Insider I don’t own this coin... it’s listed for sale on EBay and I simply used it as an example in an attempt to better understand the restoration process.
Well even if for the sake of argument it’s from dipping dipping doesn’t make something a details coin without over doing it
The only reason I’d consider looking at an MS64 Peace Dollar on eBay would be the toning. See Insider’s post
Pretty sure I know where it came from, it's nothing more than dark toning that was not removed when the coin was previously dipped. Leftovers if you will. Based on your comments Rick, (ie acid, burn, burning) and I'll admit it's possible I'm misunderstanding them, but it seems as if your thinking that dipping a coin can cause a coin or some areas on a coin to turn black. But that simply isn't true. The only thing that dipping a coin can do is make it white, even over-dipping can only make it white. Dipping will never produce dark colors. If I am misunderstanding, fine - but please explain exactly what you do mean.