Grandma's Caramel Popcorn Balls

Ingredients (6)

• + 8 quarts popped popcorn add to pantry
• ✓ 2 cups evaporated milk
• ✓ 2 cups white sugar
• ✓ 1 cup dark corn syrup (such as Karo®)
• + 1 cup margarine add to pantry
• + ⅛ teaspoon salt add to pantry