Ink smudges and never fully dries. I'm sorry I've already used it on a postcard as I was hoping the postcard could be a keepsake, but there's no way to keep the marker without smearing it. I've tried making prints on other types of paper (including the cards that came with the sets) but they all smear at the slightest touch. If you want your prints to last, save yourself the mess and choose another brand.
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