To answer your question, we need to speak about light. This isn’t a simple thing to do. About a hundred years ago, the world’s smartest scientists even argued about what light really is. And so they 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 rapidly? Well, imagine this: photons can go around the entire world more than seven instances in just one second.
When these photons attain our eyes, we see them as light. The more photons there are, the brighter the light.
Photons can come in all the colors of the rainbow. They also 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 each have more energy than red ones, for example.
Now here’s a weird thing: there are some types of light which are invisible!
For instance, ultraviolet (UV) light, which has even more energy than blue and violet light, is invisible.
Sunlight contains a few of this powerful UV light. Because it has a lot energy, it may cause numerous damage, like sunburn, if you 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 rest room, glow because they’re really hot. Regular 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 can see glow-in-the-darkish paint, however if you happen to contact it, it is just as cold as the bedroom wall. So, the glowing of the paint have to be totally different to the glowing of a light bulb.
The paint has a special kind of glowing called “luminescence” and it might probably only be created from a couple of types of material. One such material is what scientists call “luminescent phosphors”, and this is what makes your paint glow. Scientists make luminescent phosphors in the lab by mixing special chemicals 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 have to be “told to glow”. Just like your mother and father must charge their phones each night time to make them work, these supplies have to be “charged” before they begin glowing.
The truth is, the charging of your glow-in-the-darkish paint is done by different types of light. The invisible UV light with numerous energy can cost the particular 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 will be charged through the day and can glow for wholesale confetti hours in the dark at night. The charging that happens during the day, for instance by sunlight, is stored within the paint for a while, just like in the battery of a phone.
This type of paint is called phosphorescent. The other type, called fluorescent paint, solely glows while an invisible UV light is turned on to charge it.