Rock Candy Recipe

Rock candy
Pam McLean/Photodisc/Getty Images
    10 min
Ratings
Teach your kids how crystals grow with this edible rock recipe. Let each child have their own jar and their own color.

What You'll Need

  • 4 cups sugar
  • 1 cup water
  • Food coloring
  • Clean glass jar
  • String, cut into 6-inch lengths
  • Pencil

How to Make It

  • In a medium saucepan, heat 2 cups of the sugar and the water. Do not boil! Stir until the sugar is completely dissolved. Gradually add a few drops of the of your choice and the additional sugar, stirring continuously until all the sugar is dissolved.


  • Pour the solution into a clean glass jar and tie the pieces of string to the pencil and suspend them across the mouth of the jar so that the ends hang into the sugar water.


  • Crystals suitable to eat will form in an hour and continue for several days to a week. Pieces can be broken off and eaten after the first hour. (But, try to hold out for big crystals!)


  • Although you may see quick results in small measure, the larger rock candy crystals you're accustomed to seeing in the candy store will take some time to form.


  • Yield: 12 ounces


  • Recipe Source: by Nancy Birnes (Harper & Row)

  • Reprinted with permission.