Oil and Colored Water Time-lapse
I made this stop motion video by taking a picture every time a drop was added, enlarged, or popped and more frequently during times of rapid change. The water used initially was pure. Then, I began adding saline with or without the coloring to see how it would diffuse. Later I used pure water again to see how the diffusion differed. The bubble sounds were dubbed in later. I also uploaded the video to YouTube but the soundtrack didn't keep time with the bubbles following the conversion so it is not as good as the QuickTime version.
A larger version of this video and other Time-lapse and Stop Motion videos can be seen here.