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1kg bag of our SKYBLUE glow rocks. Just a few minutes of sunshine to fully charge them or up to 10 minutes from a artificial light.\nThey glow in the dark each night and the strength of charge reduces overnight as the energy is released from the stones produce an opal effect. And a lovely atmospheric to any dark night. \nThe SKYBLUE rocks are made from Polyurethane and universal glow in the dark pigment. \nThe modern glow pigment is spread evenly through the stone so you can cut a stone in half and the 2 halves glow equally as well as the original stone.\nThe stones are very hard\nCAUTION: Please do not swallow\n\nProduct: Aquatic Sky\nHigh Quality BioLuminate pigment\nPolyurethane stones.\nAvailable at: vendorsense.com