Burgundy Toning On Mercury Dime

It's impossible to tell from that picture. Natural toning is a lengthy process as the metal reacts to its storage environment. That dime placed in a manila folder for 25 years could come out looking like that.

It takes a trained eye to determine the difference. AT looks blotchy and appear to float on the surface of the coin. Natural toning is more uniform in appearance and is integrated with the coins devices. With better (closer/sharper) pictures we may be able to determine if this one was natural or "accelerated".

In the meantime, here's another recent purchase I made...

First I'd like to congradulate you on one of the worst photos posted here in a long time. Well maybe not the all time but sure is blurry. Regardless, Silver tones to all sorts of gasses differently. Oxygen, Flourine, Chlorine, Sulfur Oxides and on and on. From what I can see it appears someone was drinking a Manhattan, breathed on that coin, stored it away in the oven.
It appears to be a 1936 for $8.95 or a 1816 for that price. Really need a better photo. Carefully take it out of the flip. Do not touch the coin since you could ruin that toning. From what I see so far it does appear to be really excessively toned and by what is really difficult to tell.

First one looks weird, it almost looks like 'terminator toning'

That was my problem too - I'm definitely not comfortable saying it's natural because I haven't seen natural like that. But it doesn't look obviously artificial either. I'll also note that it does not smell like sulfur.

I really like the toning on the reverse of the '45. Very dramatic.

May I say this - this is why in the future I will collect Mercury dimes. The toning that comes no these things, well it comes in so many different types. That 1945 you posted is my absolute favorite type on these coins. It's like someone is saying "check out the reverse on this coin"

The original coin, in my opinion (which isn't a great one) is natural. My father has some Roosies in an album that have toned really dark over time. His are gritty and unattractive unfortunately. I think yours is pretty cool and worth throwing in a 2x2 to hold onto.

I'm far from a toned coin fan but I like just the opposite of the above. As already noted teh 45 is already graded but I still like the uniqueness of the 36 much more. Again, not fan of toning but if a coin is toned, I would prefer it to be different.