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In page Charlie and the Chocolate Factory:

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The Warming Candy Room is dominated by a boiler, which heats a scarlet liquid. The liquid is dispensed one drop at a time, where it cools and forms a hard shell, storing the heat and "by a magic process ... the hot heat changes into an amazing thing called 'cold heat.'" After eating a single warming candy, one could stand naked in the snow comfortably. This is met with predictable disbelief from Clarence Crump, Bertie Upside, and Terence Roper, who proceed to eat at least 100 warming candies each, resulting in profuse perspiration. The three boys and their families discontinue the tour after they are taken to cool off "in the large refrigerator for a few hours."[2]