By vickie guy from Earle, AR
You would need a candy thermometer. It will give you the exact boiling temp of the sugar water combo needed for the mixture to harden. There is a "test" you can do with water in a cup and you drop little drops of the mixture into it. Sorry I don't remember the rest. I honestly think the thermometer is what you need. Good Luck
This link has all the answers you need ;-)
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I'm looking for a recipe for rock candy. The one my son and I tried left us with jars of moldy sticks! Thanks in advance!