Smithsonian Magic Rocks Value Set

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Create a brilliant underwater crystals with this kit! Place your coloured stones (metal salt crystals) into the magic solution (sodium silicate dissolved in water) and watch them g row into colourful crystal formations. In six hours, repeat these steps and watch with amazement as your rocks expand into colorful stalagmite-like towers. Each set includes a sticker sheet. Watch colourful crystal formations grow before your eyes! Rocks grow to different heights up to 4" tall. Crystals begin growing in just 10 minutes. Ages 10+ Show more