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"How to Make Ice Marbles: Things you'll need\nKool-aid powder and/or food colouring\nBalloons\nSome cold weather or a freezer\nA knife\n\nInstructions\nPut a few drops of food colouring or Kool-aid powder into a balloon then fill with water.\n\nPlace outside, if it's cold enough, or …"
<https://www.instructables.com/How-To-Make-Ice-Marbles/>