Zubbles

Coming soon to a toy store near you... colored bubbles! Quaint as it may sound, producing colored bubbles is no simple feat, with the inventor having to spend a lot of time and money experimenting with various recipes. The icing on the cake though is that the colored bubbles actually lose their coloration upon contact with skin and clothes, leaving no visible trace of their evanescent existence. This required the effort of a dye chemist in creating a whole new class of dyes.

Read about how colored bubbles came to be (Popular Science)