Science, Tech, Math › Science Grow Calcium Chloride Crystals Share Flipboard Email Print ThoughtCo / Anne Helmenstine Science Chemistry Projects & Experiments Basics Chemical Laws Molecules Periodic Table Scientific Method Biochemistry Physical Chemistry Medical Chemistry Chemistry In Everyday Life Famous Chemists Activities for Kids Abbreviations & Acronyms Biology Physics Geology Astronomy Weather & Climate By Anne Marie Helmenstine, Ph.D. Chemistry Expert Ph.D., Biomedical Sciences, University of Tennessee at Knoxville B.A., Physics and Mathematics, Hastings College Dr. Helmenstine holds a Ph.D. in biomedical sciences and is a science writer, educator, and consultant. She has taught science courses at the high school, college, and graduate levels. our editorial process Facebook Facebook Twitter Twitter Anne Marie Helmenstine, Ph.D. Updated January 15, 2020 It's easy to grow calcium chloride crystals. The crystals are thin, six-sided needles that catch the light so that they seem to glow from within. Materials calcium chloride (CaCl2)water (H2O) Although you may not know it, you probably have calcium chloride in your home. This salt is used in moisture control products, such as DampRid, and in salt to remove ice from sidewalks. If you use road salt, check the label to make sure it's calcium chloride and not another chemical. You can also order calcium chloride online. Growing Crystals The procedure for growing calcium chloride crystals is essentially the same as growing table salt crystals or those of any salt. Heat water to a full, rolling boil. The solubility of any salt is highly dependent on temperature.Stir in calcium chloride until it stops dissolving. If you like, you can filter the solution into a new container, discarding any remaining solids.Place the container with the solution in a place where it won't be disturbed. Let the crystals grow. Tips Ordinarily, you can remove crystals and preserve them, but calcium chloride is so hygroscopic, taking the crystals out and leaving them in the open air will lead to degradation within hours. It's best to appreciate these crystals in their solution.Calcium chloride crystals are naturally colorless. You can try to color the crystals by adding food coloring to the crystal growing solution.One easy way to grow these crystals is simply to leave a container of DampRid hanging in your home or vehicle. Eventually, the conditions will become right for crystal formation.