We have this clear soap dispenser in our bathroom, and when we are lucky enough to need to refill it we are treated to a multi-day ballet. The past several times we have filled it with a different type of soap than was previously in it. One transparent and one opaque. The first day or two not much happens. But slowly they start to work into each other. So every time you go to wash your hands its slightly different than it was before. Eventually they turn into gauzy, delicate, transparent strands , and completely envelope each other. In any case, both my wife and I are fascinated by the process.