To answer your question, we need to talk about light. This just isn’t a straightforward thing to do. About one 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 definitely a bunch of tiny things that scientists call “photons”. These little things can travel unbelievably quickly.
How quickly? Well, imagine this: photons can go around the entire 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 come in all the colours of the rainbow. Additionally 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 weird thing: there are some types of light which are invisible!
For example, ultraviolet (UV) light, which has even more energy than blue and violet light, is invisible.
Sunlight accommodates some of this powerful UV light. Because it has a lot energy, it may possibly cause plenty of damage, like sunburn, when you get an excessive amount of 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, like the Sun or an old light bulb in your rest room, glow because they are really hot. Normal glowing, like that of the Sun and a light bulb, requires objects to be really hot for us to see it.
As you already know, you possibly can see glow-in-the-darkish paint, however when you touch it, it is just as cold because the bedroom wall. So, the glowing of the paint must be completely different to the glowing of a light bulb.
The paint has a particular kind of glowing called “luminescence” and it might only be created from a couple 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 within the lab by mixing special chemical substances together, and then add them to the paint. The paint is then sold to factories and producers who put it on toys, stickers, colour run powder and even inside colouring pens.
While some things glow all the time, like the sun, glow-in-the-dark paint should be “told to glow”. Just like your parents need to charge their phones every night to make them work, these materials have to be “charged” before they begin glowing.
The truth is, the charging of your glow-in-the-darkish paint is finished 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 different types of glow-in-the-darkish paint. One type can be charged during the day and can glow for hours at the hours of darkness at night. The charging that happens during the day, for example by sunlight, is stored within the paint for some time, just like in 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.