Crystal Candy (Rock Candy)
This sparkling Crystal Candy, also known as rock candy, is a fun and easy treat made from simple sugar syrup and a little patience. Perfect for science experiments, party favors, or just a sweet snack with a magical look! These glittering sugar crystals grow on sticks or strings and can be customized with your favorite colors and flavors.
Equipment
- wooden skewers or cotton string
- tall jars or glasses
Ingredients
- 2 cups granulated sugar
- 1 cup water
- 1-2 drops food coloring optional
- 1/2 tsp flavoring extract vanilla, lemon, peppermint, etc., optional
- extra sugar for coating sticks
Instructions
- Prep the Sticks: Soak wooden skewers in water, then roll in granulated sugar. Let dry completely to create a crystal “starter” surface.
- Make the Sugar Solution: In a saucepan, bring 1 cup water to a simmer. Slowly stir in 2 cups sugar until completely dissolved. Keep adding sugar until it no longer dissolves—this creates a supersaturated solution.
- Cool & Add Color/Flavor: Remove from heat. Let cool for 10 minutes. Stir in food coloring and flavoring extract, if using.
- Fill Jars: Pour the sugar solution into clean jars or glasses. Place one prepared stick into the center of each jar, secured with a clothespin across the top to hold it upright and suspended
- Let Crystals Grow: Set jars in a cool, undisturbed area. Watch crystals form over 5–7 days. The longer they grow, the bigger they get!
- Finish: Once crystals reach desired size, remove sticks and let dry for a few hours. Store in an airtight container.
Notes
- Best Flavor Ideas: Peppermint (red or green), Lemon (yellow), Vanilla (blue), Raspberry (pink), Grape (purple).
- Natural Coloring Options: Beet juice (red), turmeric (yellow), butterfly pea flower (blue).
- Pro Tip: Crystals grow best in a quiet, cool space. Avoid moving or disturbing the jars during growth.
- Storage: Keep finished candy in an airtight container away from humidity. Add rice or a silica gel pack to absorb moisture.
- Kid-Friendly: Let children help with coloring and flavoring choices and check progress daily—it's a tasty science lesson!