What is the "special green paper" that shows the magnetic field they are using? | Hacker News

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		po on Dec 21, 2011 \| parent \| context \| favorite \| on: Dropping a Magnet Through a Copper Pipe What is the "special green paper" that shows the magnetic field they are using?

carey on Dec 21, 2011 [–]

Searching for "magnetic field paper" leads me to http://www.grand-illusions.com/acatalog/Magnetic_Field_Paper... .

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