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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: looool
Date: Jun 22, 2015


By: adaeshia
Date: Jun 08, 2015

thank you for your helpful ideas

By: Karen
Date: Jun 03, 2015

My won made this for a science project. How long will the crystals last after being removed from the refrigerator?
I need answer ASAP


By: toe_gurl
Date: May 12, 2015

i didnt enjoy this very much but my 24 son did! he is such a child! it did look very cool though. !!

but i was wondering how long do the crystals last??

thanks again for the wonderfull idea!!!!!!!!!!!!!!!!!!!! bye now x

By: macie
Date: Apr 27, 2015

how long does the crystal last

By: Sam
Date: Apr 04, 2015

It was fun making these crystals :-)

By: faith
Date: Mar 26, 2015

how long does it take to become hard to be able to touch it without it breaking apart or smooshing

Date: Mar 03, 2015

This worked great!:)

By: anu
Date: Feb 24, 2015

How long does the crystal last ?

By: Joshua' Ferrell
Date: Feb 03, 2015

how long does it take to form