How to remove permanent marker from shells

[Lordhermitcrab]

So, digging around in my shell pile, I found this wonderful shell that would probably make one of my crabs happy. It's a good size, and it's smooth.

But the reason it had disappeared was because the place I got it from, wherever that was, had it decorated with permanent marker. Like a painted shell but just very lazy.

I want to get the marker off and I've tried a lot of stuff, but to no avail.

Does anyone have any recommendations, preferably safe for hermit crabs?

[AML]

Try soaking it in rubbing alcohol then boiling it to get the alcohol off??

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[soilentgringa]

Shells are porous, there is really no way to remove the sharpie without making the shell unfit for crabs to live in.