Same as our original magnetic viewing film, but four times bigger.
Amazing stuff! It shows the shape of magnetic fields in action. This green magnetic viewing film will become lighter or darker when a magnetic field is applied. It turns dark when the field lines are perpendicular the the surface, and it turns light when the field lines are horizontal, i.e., across the surface. If a magnet is placed under it, with one of the poles facing the film, it will show the magnet as dark with a light outline. The effect gets interesting when you have lots of magnets, or magnets that are polarized in a unique way. The entertainment value of this stuff is unmatched, even by the likes of playing Pac-man or watching professional wrestling!
Re-usable indefinitely, until your kids scratch it up so badly its hard to see. Get some for them, and more for you!
You can see some of our fun experiments using this stuff on our Magnetic Viewing Film page.