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The Ghost Crystals 100 g amazes students! A vial appears to contain only water and a hanging string. When the string is lifted, a large crystal is found on the string. When the string is lowered into the water, the crystal turns invisible!

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A vial appears to contain only water and a small string hanging down into it. When the string is lifted out, a large shiny crystal is found to be tied up in the string. When the string is lowered back into the water, the crystal again becomes invisible! Instructions included.