Specifically, we found out that we had to add soap to milk in order to break the surface tension and allow the spots of liquid colouring on the surface to mix...
We also found out that when we put skittles into water, the colour dissolves. However, because the colour is denser than the water it does not float and mix across the dish, but rather sinks to the bottom. It sits alongside other colours much like blobs of paint can sit side by side without mixing in the atmosphere! Jesse says it looks "like a dancefloor", and it makes Tayla think of "the internet connection on Miss Driver's computer" (it certainly spends a lot of time spinning around like a rainbow disk!).
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