@o_lampe kids' markers are your friend. I've left "Medium felt-tip pen STABILO power" markers (I'd post link but can't yet) without cap for months and they still write
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RE: Duet Polargraph
@o_lampe kids' markers are your friend. I've left "Medium felt-tip pen STABILO power" markers (I'd post link but can't yet) without cap for months and they still write