Growing crystals can take several days, but this super-easy recipe gives you a cup full of needle-like crystals in just a few hours!
Epsom salt is another name for the chemical magnesium sulfate. The temperature of the water determines how much magnesium sulfate it can hold; it will dissolve more when it is hotter. Cooling the solution rapidly encourages fast crystal growth, since there is less room for the dissolved salt in the cooler, denser solution. As the solution cools, the magnesium sulfate atoms run into each other and join together in a crystal structure. Crystals grown this way will be small, thin, and numerous. Left undisturbed, the crystals should last months or more!
To grow large single crystals, you'll need to follow the evaporation procedure in this project.