A sharpie would work just fine and is not harmful.
I use india ink with a layer of nylon nail protector over it. You can do the same thing with the Sharpie... cover the mark with the nylon nail protection. I've got marks lasting over 10 yrears so far.
Quote:
Originally Posted by ben_e71
If I want to mark one of the Hermann's shells to tell it apart from the others what can I use? Would a sharpie be okay?
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