Genuine 'Green Film' manufactured in the USA and held in stock in the UK
If two magnets are placed next to each other, poles facing up and down, and arranged to attract each other, their poles are dark, but a thin line between the poles is bright where the flakes reflect light.
The film cannot be used for AC electromagnets as it will not show rapidly changing magnetic fields. It cannot be used to distinguish between north or south poles. It will also not distinguish very small field variations that you encounter on magnetic tape or magnetic strips on the back of debit or credit cards.
The photos show some the hundreds of interesting images that are possible by placing this highly flexible film directly onto different shaped or oriented magnets.
Colour - Green Thickness - 0.006 inches to 0.008 inches, 0.152 mm to 0.203 mm