Cotton Candy Marshmallows

Name: Cotton Candy Marshmallows
Prep time: 4 h 40 min
Total time: 4 h 40 min
Cuisine: American
Ingredients: Nonstick spray, for greasing tin and knife; 240 milliliters water (1 cup), divided; 20 grams powdered gelatin (2 tablespoons); 400 grams granulated sugar (2 cups); 170 grams corn syrup (1/2 cup); 1/4 teaspoon fine sea salt; 1 teaspoon cotton candy flavoring, or to taste; Pink gel food coloring (I used Neon Brite Pink); Blue gel food coloring (I used Neon Brite Blue); 50 grams confectioner’s sugar (1/3 cup); 50 grams potato starch (1/3 cup)