To reply your query, we have to talk about light. This shouldn’t be a simple thing to do. About one hundred years ago, the world’s smartest scientists even argued about what light really is. And they argued for many years.
Light is definitely a bunch of tiny things that scientists call “photons”. These little things can journey unbelievably quickly.
How quickly? Well, imagine this: photons can go around the whole world more than seven instances 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 come in all the colours of the rainbow. Additionally they hold energy which can turn 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 is a bizarre thing: there are some types of light which can be invisible!
For example, ultraviolet (UV) light, which has even more energy than blue and violet light, is invisible.
Sunlight incorporates some of this powerful UV light. Because it has a lot energy, it will possibly cause quite a lot of damage, like sunburn, diffraction glasses should you get too much of it in 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 bathroom, glow because they’re really hot. Normal glowing, like that of the Sun and a light bulb, requires objects to be really sizzling for us to see it.
As you already know, you’ll be able to see glow-in-the-dark paint, but when you contact it, it is 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 particular kind of glowing called “luminescence” and it might probably solely be created from a number of types of material. One such materials is what scientists call “luminescent phosphors”, and this is what makes your paint glow. Scientists make luminescent phosphors in the lab by mixing special chemical compounds collectively, and then add them to the paint. The paint is then sold to factories and producers who put it on toys, stickers, and even inside colouring pens.
While some things glow all the time, like the sun, glow-in-the-dark paint must be “told to glow”. Just like your dad and mom must charge their phones every evening to make them work, these supplies must be “charged” before they begin glowing.
In truth, the charging of your glow-in-the-dark paint is done by other types of light. The invisible UV light with a lot of energy can charge the particular phosphors in your paint and make it glow in your bedroom at night.
There are completely different types of glow-in-the-dark paint. One type can be charged during the day and might glow for hours in the dead of night at night. The charging that occurs through the day, for example by sunlight, is stored within the paint for a while, 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 cost it.