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homemade rock candy with green plants behind it.
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4.75 from 39 votes

Homemade Rock Candy

Making rock candy at home is a fun science experiment that you can eat! You can experiment with different colors and flavors. It is a great activity to do with the kids. It is extremely easy to make using just a few ingredients. Remember though this is a science experiment more than it is an exact recipe. Sometimes you can do everything right and the crystals just don't behave, haha.
Prep Time10 mins
Cook Time15 mins
Resting time5 d
Total Time5 d 25 mins
Course: Candy
Cuisine: American
Keyword: crystals, fun, kids, science, sugar
Servings: 3 Candies
Calories: 194kcal
Author: Matt Taylor

Equipment

  • pot
  • wooden spoon or spatula
  • lollipop sticks or bamboo skewers
  • wide glasses or mason jars (400 to 800ml) or wide metal thermos
  • clothespins

Ingredients

  • 1 cup of water 240 ml
  • 3 cups of white granulated sugar 600 g
  • 1 - 2 tsp flavoring

Instructions

  • Begin by dipping the sticks in water and then rolling them in sugar. A plate works well to hold the sugar. I only dip it where I want the sugar crystals to grow. Set the sticks aside and allow them to dry. These are the seed crystals that the other crystals will grow on.
  • Add a large pot to the stovetop and set to medium heat. Pour in the water and bring it to a simmer. Then add in the sugar a cup at a time, stirring it to dissolve the sugar. Bring it to a boil. If you are only using one color and flavor you can add it in right when it boils.
  • Remove the pot from the heat and allow the sugar solution to cool for 20 minutes.
  • After 20 minutes run the tap water until it gets really hot, let the water run over the glass or mason jar to heat it up until really warm. Make sure to use a wide glass or mason jar like the 800ml kind if you want larger candies, but you will get fewer of them, with this amount of liquid you will get 1 large one. Smaller mason jars or glasses for smaller candies, but you will get more of them. 2 to 3 of them.
    Pour the hot sugar solution into the containers. If you are using a metal thermos no need to heat it up. If you want different colors now would be the time to add those colors and flavors.
  • Attach a clothespin to a sugar stick and set it in the solution. If necessary use a metal ring on top of the mason jar so the clothespin can sit on it. Try and keep the stick in the very middle of the glass and at least 1.5 inches from the bottom. If it is too close to the bottom the crystals might fill up the bottom.
  • Let the crystals form for 3 to 5 days. Use a fork and gently break away any thin layer of sugar that has formed on the surface of the solution. Then pull out the rock candy and place in another container to dry for 4 hours. That's it! Enjoy!

Video

Notes

1.) Each jar of the solution has much more solution than the resulting piece of rock candy. You may reuse the solution, but you will need to reheat it and add another cup or so of sugar to replace the sugar loss.
2.) The amounts of candies will totally vary depending on what size container you use, you can make smaller candies with smaller containers, bigger containers/jars will hold more liquid making fewer candies.
 
homemade rock candy nutritional facts