Geraldine's English Toffee

1 cup white sugar                          1 cup butter
1 cup brown sugar                         1 can Sweetened Condensed Milk (14oz)
1 cup corn syrup                            Sprinkle of salt

METHOD: Place all ingredients in large heavy kettle and boil, stirring constantly. It sticks and burns easily. Stir and cook until candy forms semi-hard ball when dropped in cold water (245-248 deg. F.) Pour into buttered pan and mark into squares when nearly cold. If a harder toffee is required, cook longer. Dip or wrap in wax paper.