To answer your query, we have to talk about light. This is just not a straightforward thing to do. About a hundred years ago, the world’s smartest scientists even argued about what light really is. They usually argued for a lot of years.
Light is actually a bunch of tiny things that scientists call “photons”. These little things can journey unbelievably quickly.
How quickly? Well, imagine this: photons can go across the whole world more than seven times in just one second.
When these photons reach our eyes, we see them as light. The more photons there are, the brighter the light.
Photons can are available all the colors of the rainbow. In addition they hold energy which can flip into heat. This is why it feels warm when the sun shines.
However, not all light is the same. Blue and violet photons both have more energy than red ones, for example.
Now here’s a bizarre thing: there are some types of light that are invisible!
For example, ultraviolet (UV) light, which has even more energy than blue and violet light, is invisible.
Sunlight incorporates some of this highly effective UV light. Because it has a lot energy, it will possibly cause quite a lot of damage, like sunburn, for colour run powder those who get an excessive amount of of it on your skin.
One other invisible type of light is infrared light. Infrared means “less than red”, so this light has even less energy than red light.
Making paint glow
Many light sources, just like the Sun or an old light bulb in your toilet, glow because they’re really hot. Normal glowing, like that of the Sun and a light bulb, requires objects to be really scorching for us to see it.
As you already know, you possibly can see glow-in-the-darkish paint, however when you touch it, it’s just as cold because the bedroom wall. So, the glowing of the paint should be totally different to the glowing of a light bulb.
The paint has a special sort of glowing called “luminescence” and it may possibly solely be created from a few types of material. One such material is what scientists call “luminescent phosphors”, and this is what makes your paint glow. Scientists make luminescent phosphors within the lab by mixing particular chemical compounds collectively, and then add them to the paint. The paint is then sold to factories and manufacturers who put it on toys, stickers, and even inside colouring pens.
While some things glow on a regular basis, like the sun, glow-in-the-dark paint must be “told to glow”. Just like your parents need to charge their phones each evening to make them work, these materials have to be “charged” earlier than they begin glowing.
In fact, the charging of your glow-in-the-dark paint is completed by different types of light. The invisible UV light with plenty of energy can charge the special phosphors in your paint and make it glow in your bedroom at night.
There are totally different types of glow-in-the-darkish paint. One type might be charged in the course of the day and may glow for hours at midnight at night. The charging that occurs during the day, for instance by sunlight, is stored within the paint for some time, just like within the battery of a phone.
This type of paint is called phosphorescent. The opposite type, called fluorescent paint, solely glows while an invisible UV light is turned on to charge it.