Smithsonian - Magic Rocks Kit

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Smithsonian - Magic Rocks Kit Create a brilliant underwater crystals with this kit! Place your colored stones (metal salt crystals) into the magic solution (sodium silicate dissolv ed in water) and watch them grow into colorful 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 colorful 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