Hello all and good afternoon ! I've rarely or really never saw this degree of toning on clad Roosevelt Dimes , most always less noticeable color than these have , nearly the whole set has toned in this manner ... opinions as to how this happened and if it's normal would be very helpful and welcomed .
Copper clad tones a bit different than Silver. There are many brilliant toned coins out there. Where did you get them? were they in rolls or sets?
While not an expert on modern coinage, I would also postulate that while attractive, it's probably faux toning. No ancient coin (and to be fair, I haven't handled as many as dealers) or any which I recall being posted exhibit toning like that, and yes, they used different silver mixtures. I do have a couple of silver siliquae with somewhat of an iridescent tone, but it's not like that and I think it might have been a lucky accident resulting from PVC sleeves. Many of the rainbow toners seem to have that circular rainbow toning.
I purchased them on ebay in a roll as part of a set ... I could see they had color but much more vibrant when i saw them in hand .
I've gotten a clad coin or two from circulation with that kind of toning. I can imagine getting it from the right or wrong kind of album, but I think it's more likely from heat.
If those colors were on Silver, I would say AT. A little less on Nickel clad. They can tone to wild colors, and do not follow the same tones or patterns. As @-jeffB said it could be done with the right heat and moisture content on its own.
Those colors look like long contact with a paper product. Either albums or paper envelopes. Someone found the collection and didn't feel like bothering with it. I'm not seeing anything that immediately screams artificial - and if those are fake, they are some of the best fakes I've ever seen.
It could be very possible i assume but i would have thought if heat was used they wouldn't tone with so many colors in the progression .
I’ve seen this many times. Extended storage with exposure to heat or varying humidity, as mentioned contact to various paper types: album, envelopes, paper rolls or tubes and sleeves. Even flips will not protect coins entirely. They look like keepers, the toned ones may attract buyers/collectors who find them suitable. I don’t get any sense of AT. Nice acquisition.
I also thought it could be heat or some other accelerated method with chemicals but I could see them toning like this in an album or felt case.
Hard to tell without them in hand, but I'd err on the side of natural. However, PCGS would probably instantly label them Questionable Color and move on.
IMO, I think they pass the muster. The colors and tones are right for a straight grade. I would put them back in an album.
