Magnetic field viewing film

So imagine you have a special kind of paper that can show you where magnets are hiding. This paper is called magnetic field viewing film.

Now, you know how when you play with magnets, you can feel that they're sticking together or pushing away from each other? Well, magnets also have invisible lines of force around them called magnetic fields.

When you put the magnetic field viewing film near a magnet, those invisible lines of force make the paper change colors so you can see them! It's like a secret message that only magnets can reveal!

This kind of paper is really helpful for scientists and engineers who need to know where the magnetic fields are strongest or where they're pointing. With the magnetic field viewing film, they can see exactly where the magnets are and how strong they are. Cool, huh?