How to Make Rock Candy

By Elizabeth LaBau, About.com Guide

Carefully lower the sugared skewer or string until it hangs about 1 inch from the bottom and fasten at the top with clothespins or balanced from a pencil. Do not let the end of the skewer or string come too close to the bottom or sides of the jar, or else the rock candy will grow into the sides of the jar.

Carefully place your jar in a cool place, away from harsh lights, where it can sit undisturbed. Cover the top loosely with plastic wrap or paper towel. You should start to see sugar crystals forming within 4-6 hours. If you have seen no change to your skewer or thread after 24 hours, try boiling the sugar syrup again and dissolve another cup of sugar into it, then pour it back into the jar and insert the string or skewer again.