How to do it
6 steps. Tap one when it's done.
Aim for separate bands of colour. Gentle pouring keeps the layers apart.
All experimentsFive colours, one glass, no mixing
Rainbow Density Tower
Sugar water in five strengths, each a different colour, poured carefully so they stack into stripes. Pour it wrong and it goes brown. Pour it right and people won't believe it's only water.
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Time30 min
You get1 striped glass
DifficultyMediumSome mess
SectionLearning
This one is all yours
Nothing sharp, nothing hot, nowhere far. Tell someone what you're up to, then go ahead and do it on your own.
Why that works
Sugar water is heavier than plain water, and more sugar makes it heavier still. The heaviest layer sinks to the bottom and the lightest floats on top, and as long as you pour gently enough not to stir them, they stay in order.