To reply your query, oh!fx we need to discuss light. This isn’t a straightforward thing to do. About 100 years ago, the world’s smartest scientists even argued about what light really is. And they argued for many years.
Light is actually a bunch of tiny things that scientists call “photons”. These little things can travel unbelievably quickly.
How shortly? Well, imagine this: photons can go across the complete 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 in all the colours of the rainbow. They also hold energy which can flip into heat. This is why it feels warm when the sun shines.
But, not all light is the same. Blue and violet photons both have more energy than red ones, for example.
Now here is a weird 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 comprises some of this powerful UV light. Because it has a lot energy, it will possibly cause a number of damage, like sunburn, if you happen to get too much 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 lavatory, 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’ll be able to see glow-in-the-darkish paint, but should you contact it, it’s just as cold because the bedroom wall. So, the glowing of the paint have to be different to the glowing of a light bulb.
The paint has a particular sort of glowing called “luminescence” and it will probably only be created from just 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 in the lab by mixing particular chemicals collectively, after which 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 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 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-dark 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-dark paint. One type might be charged through the day and might glow for hours at midnight at night. The charging that occurs through the day, for example by sunlight, is stored in 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, only glows while an invisible UV light is turned on to charge it.