The power of the sun. Don’t blink or your going to miss this one. Why does the inside black balloon pop before the outside clear balloon pop when using a magnifying glass? The clear balloon has most of the light pass through it like a window, but the black balloon surface that doesn’t reflect any light… it absorbs almost all of it. With a surface absorbing all of that light, it also absorbs the energy. In this case, that energy is heat, and a lot of it. The heat absorbed by the black balloon from the focused sunlight quickly causes the bonds of the balloon to weaken until it can no longer contain the air on the inside. The pressure from the air is just too much as it explodes, releasing the air into the clear balloon.