Thames & Kosmos Glowing Chemistry handleiding

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Thames & Kosmos

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Handleiding

EXPERIMENT 3

WHAT’S HAPPENING

The aesculin from the bark makes the

drops glow under UV light. Marks left

on smooth surfaces will even glow

after they have dried. On something

like a rock, on the other hand, the

aesculin disappears fairly quickly. So

it’s best to run a few tests beforehand.

Looking for clues

You can also use aesculin solution in some fun

games, such as an evening treasure hunt.

YOU WILL NEED

› UV lamp

› Small measuring cup

› Stirring stick

› Bark from a horse-chestnut tree or buckeye

tree

HERE’S HOW

1. Place some finely-chopped chestnut or

buckeye tree bark in the measuring cup along

with a little water, and stir several times with

the stirring stick over the course of an hour.

Then fish out the rind and throw it away.

2. Take your aesculin solution outside when it’s

dark. Dip your finger into the solution and

smear a little onto a smooth surface, such as

a fence board or lamppost. It will be

practically invisible at first, but it will glow

brightly in the light of the UV lamp. Test your

markings!

3. Now it’s time to organize a sort of treasure

hunt with a friend. One of you can first go and

mark a certain route with the aesculin

solution. The other follows a little later and

has to use the UV lamp to try to discover the

markings and follow them to find a hidden

reward.

Don’t forget to wash your hands after you get

home.

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