Purple Popcorn Balls

400g sugar (2c)
1 6-oz grape juice concentrate
1tsp vinegar
3/4c water
1/2tsp salt
160g corn syrup (1/2c)

Cook to 250*F. Pour syrup over 5qts popped corn and form into balls. Rinse hands with cold water. Makes about 18.

1oz kernels (2T) will pop to about a quart.