How to best handle marked coins...

[jcole77]

The pictures are pretty self-explanatory.

 

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[enamel7]

I hope those are backwards. Alcohol wipes will remove all marker ink.

 

[LooseChange]

Another strategy is to duplicate the mark 100x on otherwise unmarked coins and dump them all over town.

 

[mxh5891]

Or just ignore and not let it bother you. Plenty of more important things to worry about. It's best to concentrate on things you can control.