Sugar glass
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Sugar glass (also called candy glass, edible glass, and breakaway glass) is used to simulate glass in movies, photographs and plays. Although it is much less likely to cause injuries than real glass, it breaks convincingly, making it an excellent choice for stunts. The substance is a brittle transparent form of sugar.
Sugar glass is made by dissolving sugar in water and heating it to at least the "hard crack" stage (approx. 150 °C) in the candy making process. Glucose or corn syrup is used to prevent the sugar from recrystallizing, by getting in the way of the sugar molecules forming crystals. Cream of tartar, which is an acid, also helps by turning the sugar into glucose and fructose.[1]
Sugar glass is used in stunt sequences of television and film in the place of real glass, as it breaks more easily and is less dangerous than real glass. Sugar glass is also used in sugar sculpture. Because sugar glass is hygroscopic, it must be used soon after preparation, or it will soften, and lose its brittle quality.
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