Auspex Scientific - The Exciting Science and Educational Store
Grow your own colorful crystals. This is a 3-in-one totally amazing science kit of crystal formation.
Experiment with crystal tower, calcite crystals, and eggshell geode.
Contains calcium carbonate, sponge, acetic acid, ferric hexacyanoferrate, and instructions.
For ages 10 and up, with adult supervision.