toning on lincoln cents

is this normal toning?
these two coins and several others I got from a local shop.. they were in a mixed roll of BU coins dated 1950 qnd up. all coins were immaculate condition and the two here were the only showing this kind of toning. I feel the stripes make them questionable .
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Looks like the toning one gets from the old Whitman coin folders.
My War Nickels https://www.pcgs.com/setregistry/nickels/jefferson-nickels-specialty-sets/jefferson-nickels-fs-basic-war-set-circulation-strikes-1942-1945/publishedset/94452
toyz4geo is correct . .
The glue on the old Whitman Blue albums was laid down in a vertical pattern by machine. Coins sitting in some of the folders under the right conditions developed a 'photographic negative' where the glue was or wasn't in the folder. It 'soaked' through the back of the sheet in a negative pattern.
The striped look is just evidence of that.
Drunner
I agree with @DRUNNER and @toyz4geo ....folder/glue pattern.... Cheers, RickO
Very interesting... when I bought them from the shop I also got several other rolls. all of them were inside the ckear plastic containers.
this roll had these two 1953 coins and from 1950 and up.
I dont think the shop looked through this one. when they bought it.
I agree. Quite a common pattern, almost always on the reverse, because as the above posters have said, that would be the side of the coin in contact with the recessed "hole" of the folder.