Toni here is a recipe for rock candy from DISNEY'S FAMILY COOKBOOK I hope this is what you are looking for.

1 1/2 cups water
6 cups sugar
food coloring
3 6-inches lengths of string

Bring the water to a boil in a saucepan. Remove form the heat and add 3 cups of the sugar, stirring until it dissolves. Slowly add the remaining sugar, reheating the water if necessary. When all the sugar has dissolved, pour into three heatproof jars or glasses. Stir 3 drops of food coloring into each jar. Tie each length of string around the middle of a pencil. Lay atop the jars so the strings hang down into the liquid. cyrstas will begin to form in 1 hour and continue to solidify for several days. If a layer forms on the surface of the water break it. When the water evaporates, the candy is ready to eat. Makes 3.