Caramel Popcorn Balls
["8 cups popped corn (about 1/2 cup unpopped)", "3/4 cup granulated sugar", "3/4 cup brown sugar (packed)", "1/2 cup light corn syrup", "1/2 cup water", "1 teaspoon white vinegar", "1/4 teaspoon salt", "3/4 cup butter or margarine"]
["Measure popped corn into large bowl.", "Combine sugars, cornsyrup, water, vinegar and salt in 2 - quart sauce pan.", "Heat to boiling over milium - high heat, stirring frequently.", "Cook stirring constantly, to 260 degrees on candy thermometer (or until small amount of mixture dropped into very cold water forms a hard ball).", "Reduce heat to low stir in butter until melted.", "Pour syrup in thin stream over corn in bowl, stirring until corn is well coated.", "Cool slightly.", "Butter hands; shape mixture into 3 - inch balls and place on waxed paper.", "Yields approximately 16 balls."]
["corn", "sugar", "brown sugar", "light corn syrup", "water", "white vinegar", "salt", "butter"]