The key to unpoppable bubbles is corn syrup. The ratio is 3 cups water, 1 cup dish soap, and 1 cup light corn syrup. (If you want them tinted, you can try dark corn syrup or food coloring, too.) Some recipes also include glycerin at 1/2 cup and 2 tablespoons of corn starch, but if you add too many ingredients, you may need to avoid putting it in the bubble machine completely. You’ll also want to make sure you clean the machine out after each operation with unbreakable bubbles.