2007 Jefferson Help With Unknown Surfaces

Looks like a struck through oil to me. Also too many pics.
John1

The surfaces look like they are struck through oil or a thin layer of grease filled with debris from the minting process. (i.e. metal shavings, dirt)

I have this coins sister/brother (Have we ever talked about calling
like coins sisters or brothers?) that's also a die clash strike. The surfaces caught my eye and then I discovered the clash marks while examining the strike through.

I always loved the eyes under the Monticello on clashed Type 4 Jefferson nickels. It makes them look sort of sinister and makes me think of the old Dracula movies with the double exposure of his eyes over the storm clouds.

Not enough to get into the devices, but just on the surface of the fields. (the outside areas of the dies) What ever was on the die, did have some grit in it. (Making the uneven texture on the coins fields)