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"I used these as part of our Harry Potter Halloween party.  We secretly placed one in each child's cauldron (small bowl) which was filled with water.  During the potions lesson we had the kids say a spell (Aperacium), tap the cauldron with their wands, and pull out the ghost egg.  Every kid was blown away, several kids really thought it was magic.  The parents were suitably impressed.   Best Halloween stunt ever!"
<https://dev.staging.sss.co134.com/store/jelly-marbles-clear-spheres-kit.html>