Thames & Kosmos Glowing Chemistry handleiding

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Thames & Kosmos

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Handleiding

Invisible Light

Brighteners…

…make laundry and paper whiter.

Normally, these materials look slightly

yellow even in their pure state. The

brighteners capture ultraviolet light and

convert it into light blue light. So laundry

and paper can appear to emit even more

light than the light that shines on them.

The light blue mixes with the yellow tint

to make white, which strengthens the

light intensity even more.

Sunscreen

A certain amount of UV light is essential, producing the vitamin D3 in our skin that

we all need for good health. Children in industrial regions used to be frequently

sick due to the fact that the smoke from factories blocked too much sunlight.

On the other hand, too much UV light can also make you sick. It causes sunburn

and long-term exposure can even lead to skin cancer (no worries—the light from

your UV lamp is much too weak for that). That’s why you have to protect yourself

from excessive solar radiation. The skin will create its own protection in the form of

a brown pigment called melanin. A suntan used to be considered very cool. Today

we know that too much UV light damages the skin. So you should always apply

sunscreen (with the highest effective sun protection factor) before going out in the

hot sun, and you should also avoid staying in the sun for too long. Sunscreen

lotions contain substances that filter out the harmful portions of the UV spectrum.

Fluorescent (neon) paints…

…also capture ultraviolet and violet daylight

and convert it into other colors such as red,

yellow, or green. That gives them a particularly

brilliant effect, and makes them useful for

signals and warning signs — especially at dusk

or in cloudy weather, when the daylight

contains more blue. There are also some artists

who work with these kinds of paints to create

fantastically colorful pictures that look

positively otherworldly when viewed under UV

light.

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