Step 1: Materials
Skewer Stick, spoon or something that covers the span of your jar
Step 2: Preparation
Place the pot on the stove over medium heat. Heat until you start to see steam rise off the surface of the water. Now, slowly stir in sugar. Keep adding sugar until vigorous stirring does not dissolve additional sugar.
Next, pour the sugar syrup into a jar. Take care not to allow any sugar sediment to pour into the jar.
Step 3: Make Candy!
Place your jar in a place that it won't be disturbed for about a week.
After about a week, pull out your candy! If you don't see any growth within the first few days -- drain the sugar water into a pot, heat it and add more sugar. Also check that your string isn't super slippery.
If ants are a problem, place your jar on a plate of water - then add a few drops of detergent. This makes an ant moat.
Here at instructables HQ -- ants are a problem when it comes to leaving food on the counter.
*Do not use nylon or other synthetic stings as these are too slippery for candy crystal growth. Coarse cotton twine works best, providing locations for crystal growth to begin (these are called nucleation sites).
Step 4: Break Through
Step 5: How It Works
The string provides the nucleation sites for crystal growth. As the water evaporates, more sugar crystallizes on the string - growing the rock candy.