Your cart is empty.
Your cart is empty.
Placing magnet behind magnetic flux viewing film changes color by magnetic level.
Color change according to magnetic intensity
Color Gauss
50-100G Orange
100-150G Yellow
150-250G Light Green
250-300G Green
300-500G Dark Green
600-800G Blue
900-1000G Dark Blue
Film thickkness (μm): 150~200
Heat resistance test: 75℃ 48H
Coonstant temperature and humidity test: 60℃/80℃ 48H
Outdoor exposure test 48H
Brian
September 4, 2025
I purchased this on a whim and have been amazed at how fun it's been to explore magnets with. If you buy this, CHECK OUT A REFRIGERATOR MAGNET! I always thought those cheap magnets were unnoteworthy. It blew my mind to see (and then learn after some googling) that they're a clever arrangement of magnetic field domains known as a Halbach array, which doubles the field on one side (the back) and essentially cancels it on the other (the front). See the striped pattern in my first picture, and check out the Wikipedia articles on Halbach arrays and on refrigerator magnets for more info. For a cool effect, try stacking two fridge magnets and look at the interference patterns as you rotate one while holding the other steady.What caught my attention about this particular viewing film was its multi-color nature based on field strength (many others are monochromatic) and the fact that it "resets" as the fields are taken away, allowing you to see what magnetic fields are currently present and not some mess of the past history. The film appears to change almost immediately at room temperature (not sluggish) as you move a magnet. I don't know how fast it actually is, but I suspect it wouldn't keep up with very rapid changes.This viewing film came with a rigid protective plastic case and a little card showing a rough scale for color versus field strength. I'd take the numbers with a grain of salt, but the color gradient does add some nice qualitative information about the shape and strength of the fields. Colors indicate fields normal (perpendicular) to the plane of the film, and the neutral brownish-yellow color indicates either no appreciable field strength, or fields that are tangential (parallel) to the plane of the film. Although you can't differentiate between North and South, you can easily see where fields are concentrated and where the magnetic field direction changes.Also pictured on the included card is an indication of how the film works. Just guessing, but it looks to me like it might be a thin-film interference effect, where the interference region thickness (which sets the color) depends on how strongly pulled down the internal particles are (which depends on field strength).This would make a great gift for STEM-interested folks (kids and adults alike).
Phillip K.
August 14, 2025
Crisp lines at the edge of the magnet and change of color extending beyond showing the field strength.I have an old hard drive magnet that shows two reddish fields about an inch away from the magnet. You put the film next to the magnet it shows blue/purple edges. green toward the middle and a one inch complex yellow field around the whole thing. A broken stack of magnets or the back of an iPhone is very interesting to look at.
Customer
August 8, 2025
The media could not be loaded.
Somebody You Don't Know
July 29, 2025
This basically works, but it takes a pretty strong magnet to really show up on it. Still, a nifty thing. I gave a piece of this to a friend of mine as a present with no explanation and challenged him to figure out what it was for. He still hasn't figured it out :-).
Customer
July 23, 2025
Nice to be able to see where the little magnets are in various products in case you want to do little modifications like drilling holes or cutting notches without wrecking the magnetic function. Also fun to see where they really are, how big, which direction N/S poles face, etc.
BJ engineer
April 27, 2025
I placed it between and alnico magnet and sensor and could hardly see the field. Sensor activates around 50 Gauss. I was hoping to see field pattern between sensor and magnet. I expected orange near sensor and light green near magnet. It was 1" diameter 3/8" thick magnet south facing sensor.
John Morse
March 21, 2025
These are kind of cool for saying the North and South fields of your magnets. I'm not sure what practical use they have but they are neat
Steven Starcke
March 11, 2025
This magnetic film viewer is amazing. It responds best to strong fields and gives a view in color! Being able to "see" magnetic fields in real time is very educational. Every science classroom and lab should have some of this film. I use magnetron sputter targets and being able to see the magnetic field has already saved me ten times the price. It shows up bad magnetic arrays instantly. To view larger assemblies, I glue 4 pieces onto a plastic sheet. Highly recommended!
Physics Guy
February 15, 2025
I had been looking at this magnetic viewing paper for some time as I had an application that would benefit from viewing magnetic field. At first I was put off by the price as $50 is a lot for a 4 inch square of paper but I was also intrigued by the fact that this paper contained colouration to depict different magnetic fields. I decided on this paper, the more expensive option, and hoped I made a good decision.This magnetic viewing paper works great. I am happy that my copy doesn't have the border as shown in the images - mine looks like it is just laminated - which aids in my application of the paper. People that I show this magnetic viewing paper to are amazed on how well it works and how it seems to instantly revert back to its normal state when the magnetic field is removed. Overall, I am happy with this purchase. An option to have this same paper in larger dimensions would be nice - as well as a lower price - but I am currently happy with my purchase.
Consumo ergo sum
February 13, 2025
Diese Folie ist zwar deutlich teurer als die üblichen monochromatischen Magnetflux-Folien, ermöglicht aber tatsächlich eine wesentlich differenziertere und zuverlässig reproduzierbare Darstellung von Magnetfeldern. Außerdem weist diese Folie fast keine Remanenz auf und kann auch in stärkeren Magnetfeldern beliebig oft wiederverwendet werden.
Dave Dave
February 4, 2025
Quality piece of film that comes with a good snap lid protective case! Also included is the color chart for gause readings.
Recommended Products
$33.24
$ 16 .99 $16.99
$32.88
$ 16 .99 $16.99