so the cleaned chips looked like this
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The mint chips are on the left an the cleaned chips are on the right
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so it appears that oiling chips prior to using them makes it easier to clean with just reoiling them; preventing permanent color transfer.
Obviously, since I didn't use a stack of non oiled chips with this experiment to compare to the oiled chips it may be that oiling makes no difference.
It should be noted that even after wiping them off twice with oil there was some color transfer. Still all in all I was very pleased with how these chips clean up
after 3 days of continuous shuffling. I don't think it would be a bad idea to oil chips before putting them into play if you're interested in minimizing color transfer.