Reviews of CMS Magnetics® 3" x 3" Green Magnetic Field Viewing Film, Fun!

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I'm not sure how the advertising picture was created, but the actual magnetic field film is paper thin and hand cut to the size ordered. There is no backlit green glow. I had the impression that the item was a bit thicker/stronger... perhaps because of the description of millions of metallic particles held in an oil suspension... who knew you could do that in the thickness of a sheet of paper? That said, it does reveal the magnetic field of magnets held beneath it. The field does not disappear when the magnet is removed, but stays as is until another magnet is used to change it. It is an interesting item, but as easy to lose as a small scrap of paper.

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I used this to expand knowledge of flux field understanding. It is what it says but without experience of expectation will be somewhat disappointing. It is all that is available at this time so if you want to view the flux field use this or paper and iron filings. Ferro fluid is fun but messy. This is not messy.

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shows fields woooooah!

They are thin sheets which is totally fine with me. They can get marred or scratched and this impedes their viewing of magananananants.

They work pretty well for the $, be mindful of hard scratches and you'll be fine.

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I was gathering "toys I wanted as a child, but could never afford" when I found this. Pretty neat. I didn't know that those flat magnetic strips had stripped (i.e. alternating N/S/N/S..) poles along the surface. Amused some friends too.

Added to my collection of other toys: diffraction grating, radiometer, and more.

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A magnetically-reactive film for viewing magnetic fields is a great idea. The cost of such a film reduces its appeal tremendously. I bought this to observe magnetic fields at a micro level. It turns out that that can't be done with this film (at least I couldn't do it to my satisfaction).

If you want to see magnetic fields in action, I suggest placing iron filings or magnetite sand (from beach sand, for example) on a paper plate with the subject magnet on the plate's underside. That is the cheap and just-as-effective way to show magnetic fields on a macro scale. When your done, fold the plate, dump the the filings or sand in a bottle and save for later experiments.