Smithsonian - Magic Rocks
Watch the colorful crystals grow in the aquarium! Simply place the rocks at the bottom of the tank and add the solution. Within 2 hours, the rocks will grow up to 4 inches. (Don't forget to decorate the tank with the stickers and outer space background first!)
Ages 8+ ADULT SUPERVISION REQUIRED.
1 space background print, 1 sticker sheet, 1 pkg metallic salts, 2 pkg. sodium silicate, 1 8.5 x 2 x 5.5 inch aquarium, and detailed instructions.
SORRY, SHIPS TO U.S. ONLY.