Thank you both!
coop -
That might be it. Grease didn't even cross my mind. It's more waxy/dense than what I usually think of as grease, but also more oily than something like paraffin. It definitely 'collects' around the edges and in any indentation and can be removed. What really threw me off was seeing it on a few pennies that definitely did not appear uncirculated; but then seeing it in 3 other unc rolls as well, I just couldn't figure it out.
Crazyb0 -
Yes, sorry. The pennies in each roll are all the same date (though the 4 rolls I've now encountered this on were different years/mm (roll of 59,roll of 61D, 62, 62D)). It sounds like you're saying waxy stuff might be used to alter the tone? This too might explain it.
I don't blame you on avoiding
ebay. On occasion I've gotten something I'm pretty excited about, but there are *so many* scammers & counterfeit coins & etc etc that I often want absolutely nothing to do with it.
Good to know about the foil. I wondered about it after seeing some rolls that were stored in foil and had that deep, rich, beautiful red, but wasn't sure about it good or bad & didn't want to risk the latter. I read a bit about storage methods (inert plastic, moisture) but I'm still trying to figure out how to balance looking at them on occasion and protecting them from turning brown or spotty.
If you're willing to share, what auction sites do you use?
Thank you both, again. This helps a lot.