Magic Potion Trick For Kids [closed]








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I am currently trying to make a magic potion with chemistry.


I want to turn black liquid clear to reveal a hidden message. 


I am currently using water, blue and red food colour and bleach. This works but I want something more dramatic and safe for kids. 


Any Ideas :)? 


regards Daniel




One possibility: Starch/iodine solution + sodium thiosulfate. The starch/iodine solution goes from dark blue/black to clear when sodium thiosulfate reduces the iodine.


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