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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. To grow large single crystals, you'll need to follow the evaporation procedure in this project.

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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

By: Erick
Date: Jan 08, 2015

I tried this experiment but nothing happen I used epsom salt and mixed it with tap hot water but it didn’t work, didnt measured the water or the salt   Is that the reason why i couldn’t grow the crystals?

By: Cawanda Fields
Date: Nov 11, 2014

I wanted to know does it matter what type of salt you use in this experiment.

By: N/A
Date: Nov 10, 2014

how many hours did it take to grow the crystals?

By: Nadine
Date: Oct 09, 2014

These crystals are AMAZING!!!!!!!!!!

By: Jennifer
Date: Sep 25, 2014

I tride this and it was amzing

By: samantha
Date: May 20, 2014

I’m hoping to try this with my daughter. Could you please tell me what happens if you leave the crystals in the remaining solution, do they keep on growing? Also, once you do pour off the solution, how long do the crystals last for? Thanks!