Thames & Kosmos Glowing Chemistry handleiding

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Thames & Kosmos

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Handleiding

EXPERIMENT 4

Invisible Light

UV-fluorescent soap

bubbles

You can’t normally see soap bubbles in the

dark. But with the help of aesculin and the UV

lamp, you will be able to blow some bubbles

with a ghostly glow.

YOU WILL NEED

› UV lamp

› Large measuring cup

› Small measuring cup

› Stirring stick

› Horse-chestnut or buckeye tree bark

› Soap bubble solution (toy store)

HERE’S HOW

1. Fill the small measuring cup about halfway

with finely-chopped chestnut bark. Pour the

soap bubble solution into the large

measuring cup and add the chestnut bark.

2. Stir now and then with the stirring stick over

the course of an hour. Then, carefully pour

the brown solution off the bark (leaving the

pieces of bark behind) and back into the

original soap bubble container.

3. Blow soap bubbles in the dark and shine the

UV lamp on them.

WHAT’S HAPPENING

The soap bubbles glow light blue in the dark. The

aesculin dissolves out of the bark and colors the

soap solution. That’s why the soap bubbles glow

under UV light, with the bubbles that settle onto

smooth surfaces looking particularly pretty.

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