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  2. Hot Wheels - Wikipedia

    en.wikipedia.org/wiki/Hot_Wheels

    Two other innovations were introduced briefly in Hot Wheels cars in the 1980s – Thermal Color Change paint, and rotating 'crash panel' vehicles ("Crack-Ups").The former was able to change color on exposure to hot or cold water, and there was an initial release of 20 different cars, available as sets of three vehicles.