How sugar turns into candy

By Christine Picheca
Illustrations by June Anderson

Learn about the different stages of boiling sugar and discover what sweet treat each stage creates.
How sugar turns into candy: Hard-crack stage
Hard-Crack Stage: 300˚F to 310˚F
Sugar concentration: 99%


This is the highest temperature the sugar will reach for candy. Now there is hardly any water left in the sugar. When you drop the syrup in cold water, it will form hard threads that break when you bend them.

  • Hard-crack sugar is used to make toffee, brittle, lollipops and candy apples.
Recipe to try: Caramel Apples

Note: The temperatures are for sea level. At higher altitudes, subtract 1˚F from every listed temperature for each 500 feet above sea level.

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  • Keywords : kids , cooking techniques , desserts

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