While I recognize that this video is a departure from my primary focus on the space sciences, I just had to share this video. My kids and I made this video as we explored the interactions between milk and dish soap, using food coloring to make the interaction visible.
Kind of neat, yeah? The video should show you everything you need to know to try it yourself. The degreasing elements of the dish soap break up the fat in the milk (whole milk will work better than reduced fat), and the food coloring is along for the ride.
I bet you have everything you need to try this yourself, so what are you waiting for?