WARNING: Make sure to do the following project with an adult for extra precaution.

To Make Crystal Candy, you will need:
Piece of string, about 6 inches (kite string works great)
A popsicle stick
A paper clip
One cup of water
Two cups of sugar
A glass jar (mason jars work well)
A pan

Instructions:
Tie one end of the string to the popsicle stick, tie the other end around the paperclip.
Lay the popsicle stick along the top of the jar so that the string hangs down into the jar. Make sure it’s not touching the bottom or the sides of the jar, but make it close to the bottom. When it is ready, remove the popsicle stick and string and put it on the side.
Pour hot water into a pan and bring it to a boil.
Add 1/4 cup of sugar to the boiling water, stir it until it dissolves. Repeat this step until all the sugar has been dissolved.
Have an adult help pour the sugar solution into the jar and fill it almost to the top. Put your popsicle back on top and lower the paperclip back inside of the jar, just like you practiced before. Allow the jar to cool and put it someplace where it will not be disturbed.
Check on it everyday to see the crystals start to grow, but be very careful not to disturb it. The longer you wait the bigger it will get. You can also place a coffee filter or paper towel over the jar so nothing falls in.

Citations:

Crystal Candy