Are These"Oil" Spots On Stored Lincoln?

When I pulled out my LWC binder the other day I noticed that a couple of the older ones had developed spots - not carbon or verdigris. These look like brownish oil droplets and I was wondering if they could be the hydrophobic residue of some pre-verdicare compound put on the coins before I acquired them.

I went through the back posts on all the things we do to get coins ready for storage, i.e., acetone, VerdiCare, more acetone, etc., but couldn't find anything like this. I do know that in the past, people have put everything from vegetable oil to varnish on coins to keep them looking "fresh". When I put the coin ( LWC 1909vdb-P) in the airtite a few years ago, it looked quite nice. The fingerprint wasn't visible then, but it's a base MS coin, well struck with some natural toning on the reverse. I've included quicky iPhone photos that illustrate the spots but don't make the coin look as good as it actually is.

My guess . [and I'm looking for alternate hypotheses] . is that the previous owner tried some home chemistry that may have included an acetone bath followed by a xylene/lipid application to make it prettier. The xylene evaporated after a time, leaving the lipids to coalesce. Gravity brought the droplets together which were stopped by the rim.

What do you all think? I'd like to hear from the members before I attempt to remove to spots in either acetone or xylene (lab grades) and apply a drop of real VerdiCare. Or, what?






** after previewing this, I see the photos are really, really bad; so please take my word for it that the coin is worth saving.

*** Moved by Staff to a more appropriate forum. ***