Citrus Mint Cooler
["1 c. fresh lemon juice (about 6 lemons)", "1 c. fresh orange juice (about 3 oranges)", "2 c. sugar", "2 1/2 c. water", "10 mint sprigs", "1 bottle (23 oz.) ginger ale", "water", "3 Tbsp. cornstarch", "1 Tbsp. flour", "3/4 c. light corn syrup", "1/4 c. water", "1/2 tsp. liquid or 1/4 tsp. paste food colors for each batch"]
["To Prepare Makeup:", "In a small bowl, mix cornstarch and flour. Gradually stir in light corn syrup and water until smooth.", "Pour about 1/4 cup into each of four bowls or paper cups.", "Color three of the batches with desired liquid or paste food colors.", "(Paste provides more intense color.) Leave one batch untinted.", "For additional colors, prepare more makeup."]
["lemon juice", "orange juice", "sugar", "water", "mint", "ginger ale", "water", "cornstarch", "flour", "light corn syrup", "water", "liquid"]