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Imagine drawing a design on the spectator's hand with a Sharpie, and moving it to anywhere you want. Your own hand, onto a surface, another object, or another area of the spectator's body. No chemicals and non-toxic.
Use it as your everyday sharpie and being able to pull miracles with absolutely no preparation! The every magician's best friend. No preparations, and nothing extra to carry on you but your everyday Sharpie.