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British Science Week

British Science Week is a ten-day celebration of science, technology, engineering and maths - featuring fascinating, entertaining and engaging events and activities across the UK for people of all ages.

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You will need

A flat tray (like a cookie baking tray)
Food coloring (at least 3 different colors)
Whole milk – low fat milk will not work for this experiment
Liquid soap used for washing dishes

What to do

Carefully pour the milk into the tray so that it just covers the bottom

Add about 6-8 drops of different colored food coloring onto the milk in different spots

Add about 5 drops of the liquid soap onto the drops of food coloring and watch the show!

To clean up, simply pour the colored milk down the drain. (don’t drink it!)

How does it work?

So you know where the color comes from, but why milk and liquid soap? The main job of dish soap it to go after fat and break it down. Usually the fat is on dishes from the food we eat, but fat is also in whole milk. When you drop the liquid soap onto the tray, it tried to break down the fat in the milk. While it was doing that, it caused the colors to scatter and mix creating a very colorful display. Have fun!


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