I remember making that, too - you cooked up a syrup so thick it would not take any more sugar, then hang salted strings in it for the crystals to grow on. The salt was supposed to help it along somehow. It went up above the kitchen cabinets and was checked every couple days til it was rock candy. Joanne's sells candy flavoring, in the cake decorating aisle. There is a recipe here
http://<br />
http://candy.about.co...rock_candy.htm
http://www.exploratorium.edu/cooking...ockcandy.html#
Correction - all the recipes say to dip string in sugar. Why was I thinking salt?