At first glance I thought this was about the difficulty in creating a convincing soap bubble image.
But it is actually about coloring real-life(!) soap bubbles. A very cool idea, that I'm sure has been thought of many times before, but only these guys had the tenacity to make it happen. The dyes they developed sound incredible; they lose all color except in the special circumstances of being part of a soap bubble. Even black bubles, described as "a favorite of the boys" in the article, will vanish to the same nothingness you expect from a soap bubble when popped. Out next Februrary, I'm sure I'll try them!