Use three baking sheets and line them with parchment paper. Preheat your oven to 300 degrees.
Spread out 3 cups of popped corn on each cookie sheet and set aside.
In a saucepan over medium heat, mix 1 cup of sugar, 1 T of white corn syrup, 3 T of butter, and one of the jello powders. Bring to a boil and add in the food coloring.
Boil for about 4 minutes then pour over all of the popcorn on the cookie sheet.
Put in the oven and bake for 10 minutes, stirring halfway through.
Let cool before touching. Repeat with each color of the Jello.
Notes
Use any color/flavor gelatin dessert packs you prefer.The packets of jell-o should be the 3 oz. packs.