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The exact ingredients of Silly String are kept secret. However, the original patent for Silly String lists about two-thirds of its ingredients, such as polyisobutyl methacrylate, hexabromobenzene, a touch of pigment to provide color, dibutyl phthalate, dimethyl siloxane, dichloromethane, sorbitan trioleate and chlorofluorocarbon propellants such as CFC-12.
