To reply your question, we have to discuss light. This will not be an easy thing to do. About 100 years ago, the world’s smartest scientists even argued about what light really is. They usually argued for many 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 complete 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 are available 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 both have more energy than red ones, for example.
Now here’s a bizarre thing: there are some types of light which might be invisible!
For instance, 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 may well cause plenty of damage, like sunburn, when you get too much of it in your skin.
Another 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 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 may see glow-in-the-dark paint, however should you contact it, it is just as cold as the bedroom wall. So, the glowing of the paint have to be completely different to the glowing of a light bulb.
The paint has a special form of glowing called “luminescence” and it will probably solely 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 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, confetti cannons just like the sun, glow-in-the-darkish paint have to be “told to glow”. Just like your dad and mom need to cost their phones each night time to make them work, these materials must be “charged” earlier than they begin glowing.
In truth, the charging of your glow-in-the-darkish paint is completed by other types of light. The invisible UV light with plenty of energy can cost the special 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 in the course of the day and might glow for hours in the dark at night. The charging that occurs throughout 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 other type, called fluorescent paint, solely glows while an invisible UV light is turned on to charge it.