How to Grow Epsom Salt (Magnesium Sulfate) Crystals: Epsom salt is magnesium sulfate. It's easy to grow Epsom salt crystals. The crystals typically resemble shards or spikes. Initially the crystals are clear, though they whiten over time.
This project uses hot tap water, not boiling water, so it's safer for young crystal growers. Place the crystal solution in the refrigerator and get sparkly needle-like crystals within a few minutes to a few hours. It's that easy! 1/2 cup Epsom salt 1/2 cup hot tap water food coloring (optional) instructions here: http://chemistry.about.com/od/crystalrecipes/ht/cupofcrystals.htm
Includes both the sugar crystals and the Epsom Salt crystals. Would like to have the sugar ones growing at the library for kids to check in on. (Can use "growing crystals ii" pin to keep the process going longer.)
Home-made Geodes Required materials Epsom salts 2 cups of warm water 3 or more eggs (we only the shells) Food coloring (red, green, blue, and any other color you like) Large glass Spoon Knife (optional)