Have you heard about the Magnetic Field Viewing Film ?
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Magne-View® Film - 6 in. Square (MVF0005)
Magnetic Viewing Film Supplier - Magnets By HSMAG
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Magnetic Viewing Film
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Magnetic Field Viewer Card
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CMS Magnetics 4"x6" Green Magnetic Viewing Film - Magnet Paper for Showing Magnetic Field - Walmart.com
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Magnetic Viewing Paper
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File:Magnetic field viewing film on various Refrigerator magnets 01.jpg - Wikimedia Commons
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