Rock Candy




About: Love Tec and cooking!!

Intro: Rock Candy

Welcome to my recipe for rock candy. As this is an entry in the Science of Food contest I will also be explaining the science behind this fun, tasty, and easy treat.

Step 1: Ingredients

1 1/2 Cup Water
3+ Cups Granulated Pure Cane Sugar
Food Coloring(optional)

Step 2: Materials

Tin Foil
Pint Canning Jar
Measuring Cups
1 Quart Saucepan
5 Inch Wooden Skewer
Rubber Band

Step 3: Preparation

Wash jar thoroughly

Step 4: Make the Solution

Pour water into a saucepan and add 3 cups of sugar.
Bring to a boil and slowly add more sugar until it stops dissolving.
Keep stirring sugar until it stops dissolving. Add flavor and coloring if desired.

Step 5: Start the Wait

Pour solution into jar until it is 1 1/2 inch away from the top. Cover jar in tin foil, use a rubber band to secure the foil, run the skewer in water then roll it in sugar, and poke the skewer thru the tin foil into the solution. Set in a cool dry place until the crystals stop growing. IT WILL TAKE A FEW DAYS!!!!!But you should start seeing results within a few hours.(if no crystals are forming boil the solution again and add more solution)

Step 6: Finish

Once the crystals stop growing remove the skewer form the sugar solution, wash the jar with hot water, and enjoy!!

Step 7: The Science

Now, you may be wondering what causes the crystals to grow. The answer is directly related to the sugar-to-water ratio. Two processes contribute to the growth of the crystals.The first process is precipitation. Precipitation is when there is more solute(sugar in this case) than can stay in liquid form. This is called a supersaturated solution. Because there is too much solute in the solution the sugar will separate forming crystals. The second process, evaporation, is when the water from the solution evaporates and leaves behind the sugar, hence, more crystals. Your rock candy will be made up of around 1,000,000,000,000,000(one quadrillion) sugar molecules. Wow!!!!!

Step 8: More

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    8 Discussions


    7 months ago

    Is your crystals still growing? I'd be interested to see a picture of the results.

    3 replies

    Reply 6 months ago

    Are you allowed to use pictures from the internet in your project, especially without citation?


    Reply 6 months ago

    Thanks for catching that. I wasn’t thinking. I’ll remove it as soon as possible.


    6 months ago

    Looks amazing..I am tempted to make it and then have it!..Well documented too (y)!


    7 months ago

    It had been nice to see more pictures of the process of the crowing rock candy and the result. How many hours did it take?


    Tip 7 months ago on Step 3

    The goal is to add more and more sugar until it stops dissolving