We made a Sugar Crystal for our winter nature table. It was easy and fun! my son is very proud to show off his crystal to anyone who comes over! Here is a link to directions:http://www.ehow.com/how_3863_grow-sugar-crystals.html
We let the crystal sugar set for more than 24 hours. Then pulled out the largest formation and tied string around crystal and the pencil and put it into a new jar of cold water for 24 hours.
