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In heavy 3-quart saucepan, heat brown sugar, granulated sugar, milk, corn syrup and salt to boiling, stirring constantly. Reduce heat to medium. Cook uncovered about 15 minutes, without stirring, to 236°F on candy thermometer or until small amount of mixture dropped into cup of very cold water forms a soft ball that flattens when removed from water. Cool about 1 hour, without stirring, until saucepan is cool to the touch.