To answer your query, we need to discuss light. This just isn’t 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 around the whole 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 are available all the colours of the rainbow. In addition they 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 each have more energy than red ones, for example.
Now here is a bizarre 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 comprises a few of this powerful UV light. Because it has so much energy, it could actually 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, like the Sun or confetti cannons an old light bulb in your toilet, glow because they are really hot. Regular 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-dark paint, but should you contact it, it is just as cold as the bedroom wall. So, the glowing of the paint have to be different to the glowing of a light bulb.
The paint has a special sort of glowing called “luminescence” and it can only be created from a number 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 within the lab by mixing particular chemicals together, after which 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 on a regular basis, like the sun, glow-in-the-darkish paint have to be “told to glow”. Just like your parents must charge their phones each evening to make them work, these supplies need to be “charged” earlier than they start 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 particular 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 will be charged throughout the day and can glow for hours at nighttime at night. The charging that occurs through the day, for example by sunlight, is stored in the paint for some time, 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 charge it.