the candy mixture gets closer to pure sugar. In other words, the mixture has a higher concentration of sugar.
This also raises the sugar mixture’s cooking temperature. The type of candy that results depends on this
temperature. The higher
the cooking temperature, the harder the final candy will be. Today, candy makers use
thermometers to control the cooking temperature. But before the invention of the thermometer,
they guessed
the cooking temperature by testing the candy’s properties. This is simple to do. All you do is drop a spoonful
of sugar mixture in cold water. If a thin thread forms, the candy is at the “thread” stage.
This shows that the
proper temperature (110 – 112 °C) for making syrup has been reached. If a ball forms in the water but loses its
shape when you take it out, the candy is at the “soft ball” stage. Thus, the names of
the stages match how the
sugar mixture reacts in cold water. The chart below shows how cooking temperature relates to a candy’s
hardness.
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