The breakthrough finally happened in an empty lab in Minneapolis on a Sunday this past February. As with Kehoe's first bubble, it arose from the slow, subtle refinement of a process over thousands of experiments. But Sabnis could re-create it. He synthesized a dye that would bond to the surfactants in a bubble to give it bright, vivid color but would also lose its color with friction, water or exposure to air-not fade, not transfer to something else, but go away completely, as though it had never been there. When one of these bubbles breaks on your hand, rub your hands together a few times and look: Poof. Magic. No more color. If the bubble breaks on your shirt or the carpet or the dog, you have two choices: Dab it with a touch of plain water to remove it immediately, or forget about it for half an hour. Either way, the color will soon be gone.