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Glow Crystal Growing Ships The Electronic Add-on Pack isGrow your own glow in the dark crystals with this fun and luminous chemistry experiment. The size, shape and colour of your crystal will vary according to experimental conditions but the expected finished size is 4cm high with a 5cm diameter. This is intended to be an educational kit which demonstrates a science principle in a fun way. All assembly and operation of the project should be done and supervised by an adult or ages 14+.