Hungry for more? Check out the new Exploratorium website about the Science of Food.
250° F265° F
sugar concentration: 92%
sugar concentration is rather high now, which means theres
less and less moisture in the sugar syrup. A little of this
syrup dropped into cold water will form a hard ball. If you
take the ball out of the water, it wont flatten. The ball
will be hard, but you can still change its shape by squashing
Nougat, marshmallows, gummies, divinity, and rock
candy are cooked to the hard-ball stage.