Science, Tech, Math › Science How To Grow Orange Potassium Dichromate Crystals Share Flipboard Email Print Potassium dichromate crystals occur naturally as the rare mineral lopezite. Grzegorz Framski, Creative Commons License 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 March 06, 2017 If you've mastered basic crystals, try growing an orange potassium dichromate crystal. Usually you have to use food coloring to get an orange crystal, but this crystal color is natural. Materials Potassium dichromateDistilled water Time Required Hours for seed crystal, weeks for larger single crystal What You Do Dissolve as much potassium dichromate as you can in warm water.Filter the solution, cover it, and allow it to sit undisturbed for several hours or until growth is observed. Alternatively, you could produce a seed crystal by evaporating a few drops of this solution in a shallow dish.You can grow a mass of crystals by just allowing the solution to evaporate, but for a large single crystal, decant the solution into a clean container whenever you notice growth other than on your seed crystal(s).You can control the growth of your crystal by changing the temperature of the solution or by controlling the rate of evaporation by the type of cover you put on the container (e.g., coffee filter has free airflow, sealing the container with plastic doesn't).The resulting crystals will be bright orange rectangular prisms.