A bright and delicious witch potion for Halloween!

Here is a fluorescent potion for Halloween. Disgustingly greenish and glowing in the dark. But it’s also abominably delicious and perfect for surprising your friends this Halloween.

You will need:

From 7 years old

Difficulty : easy

This experience requires the help of an adult

Buy online

Let's experiment

In a large bowl, mix 100g of lemon sherbet, 250 ml of lemonade, 100 ml of Canada dry, and 250 ml of Tonic.

Mix it all with a mixer or a soup mixer and serve immediately in large glasses.

For a touch of originality and horror, add gooey candies in the shape of spiders or earthworms.

Turn on the black light and turn off the other lights! What do you see? Your drink glows in the dark! It fluoresces!

Understand the experiment

Quinine as the basis of your fluorescent potion for Halloween

Tonic contains a molecule called quinine. This molecule, when subjected to ultraviolet light (UVs) emitted by the “black lamp”, is excited. Nature tends that any excited molecule returns to its equilibrium point. To “de-excite”, quinine releases the excess energy partly as heat and the rest as blue light. This is called fluorescence. This is why you obtain a fluorescent potion.

The blue light is of lower energy than the ultraviolet light emitted by the black lamp.

What is black light?

Ultraviolet light is very energetic radiation but is completely invisible to our eyes. Unlike white light, which contains all the colors of the rainbow, our eyes cannot detect UV, which is why the lamp is called a black light lamp.

Did you know?

In 2017, researchers discover a fluorescent frog

There are some species of fluorescent plants. But more rarely animals. But what a surprise it was for Argentine researchers when they studied the spotted tree frog. While this frog displays a green color in daylight, it turns blue when illuminated by UV light.

This is the first fluorescent amphibian detected on earth. Isn’t it wonderful?


Creates optical illusions with water

Using the properties of light to create illusions is a lot of fun. Have you ever noticed how images appear differently through a glass of water? This phenomenon is related to the refractive properties of light, an ability to change direction when it passes through another medium. […]


DNA extraction from strawberries

Extracting DNA from strawberries couldn’t be easier! With elements available in your kitchen, you will extract this immense molecule present in all living beings and be able to observe it, without a microscope. […]