This post may contain affiliate links. Please read my disclosure policy.
In one of my previous posts, I shared with you my recipe on How To Make Hard Rock Candy. That recipe is intended for rock candies on a stick. Forgive me for using the same images from that recipe, I usually always make my rock candy on a stick, but sometimes they can be hard to find, the end result will look similar.
This time, we will make a similar one but on a string. It’s basically the same process but using a different medium where the sugar crystals will grow.
Here’s how to make rock candy on a string.
Making rock candies is always fun, and it’s easy to make. The ingredients are easy to find and it makes for a good science project for the kids, too. All it takes is a few things and a little patience.
The preparation takes only a few steps but it will take some time for the crystals to start to form and grow in the string. Leaving it out for a few days will give time for the crystals to grow bigger.
There are so many colors and flavors you can play around with, making it more fun to explore. This activity isn’t just for the kids, it can also bring out the inner scientist in anyone who’s interested to give it a shot.
The Science Behind Rock Candies
How sugar crystals form in strings is just the same as how they form in sticks. The general science behind it works the same way.
A supersaturated solution is created by heating a saturated sugar solution that contains more sugar (solute) than what can be dissolved by the water (solvent).
By using a stick or a string that we hang in the middle of a container, we pour in the solution and leave it to create the crystals that will form in the stick or string.
The sugar will accumulate in the bottom of the container and will later form solid particles. These solid particles are called precipitation and the sugar crystals are what we call precipitate.
Also, as the solvent (water) cools and evaporates, the sugar solution becomes more saturated and forms more crystals. This is because the sugar molecules are moving at a slower pace and are actively forced back together.
In the process, more sugar crystals are formed, and leaving it for longer periods is how rock candies are made.
In this case, since we are using string, then this is basically how to make rock candy on a string.
Whatever flavor you have in mind, you can explore and make flavor and color combinations on your own. But just in case you need some recommendations, here are some combinations that I’ve used before.
- Blue for raspberry or blueberry
- Light blue or light pink for gummy or tutti frutti flavors
- Pink for strawberry
- Yellow for banana or lemon
- Green for peppermint, green apple, or kiwi
- Orange for cinnamon or buttered rum or maple syrup
- Red for cherry
- Purple for grape