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    Home / Science projects / Quick Crystal Cup
    • Quick Crystal Cup

      Quick Crystal Cup

      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!

      What You Need:

      What You Do:

      1. In the beaker, stir 1/2 cup of Epsom salts with 1/2 cup of very hot tap water for at least one minute. This creates a saturated solution, meaning no more salt can dissolve in the water. (Some undissolved crystals will be at the bottom of the glass.)
      2. Add a couple drops of food coloring if you want your crystals to be colored.
      3. Put the beaker in the refrigerator.
      4. Check on it in a few hours to see a beaker full of crystals! Pour off the remaining solution to examine them.

      What Happened:

      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.

      Buy Quick Crystal Cup Experiment Kit

      testing for starch kit

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    By: Annabelle
    Date: May 03, 2017

    How long wil the crystals last after I take them out of the fridge

    By: Amber king
    Date: Apr 28, 2017

    These crystal look very cool I have to try them some time

    By: Sophie
    Date: May 18, 2016

    This is a really cool project! Mine turned out beautifully.

    By: Mr. D.
    Date: Mar 14, 2016

    It is fun to compare and see different shaped deep blue crystals from the evaporation of a concentrated copper sulfate solution.  You can do both at the same time, too. CH-CUSO100 is the catalog number for the copper sulfate. Maybe it will lead to explore why crystals form with different shapes and colors?

    By: Megan
    Date: Jan 05, 2016

    This really helped me in Science, we had to come up with experiments and the best one in our table groups is going to be researched further and presented, and this one was chosen!  Thanks a ton!

    By: Ava
    Date: Oct 26, 2015

    Amazing ⭐️⭐️⭐️⭐️⭐️

    By: Bryant Merritt
    Date: Oct 21, 2015

    I like this project and I have a science Fair project

    By: jakayla wade
    Date: Oct 08, 2015

    its awesome

    By: Kim
    Date: Sep 29, 2015

    I made these crystals and dropped a sea shell in the solution. Turned out beautifully!....and that was 2 years ago! Still look great in my windowsill.

    By: paige
    Date: Sep 20, 2015

    my crystals were like it was in the picture,  then, after a few minutes, it turned to slush!