Harry Pearson gives the Furutech the Golden Ear Award. www.theabsolutesound.com Septembe 2011. Issue 215. How does it work according to HP:
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The colored pigment that makes an LP look black contains iron particles that becomes the source of magnetic information when the disc is spinning ,inducing unwanted electronic interference with magnets in the phono cartridge (particularly those in moving coil designs).
A pretty good description of:Faraday's Law
Any change in the magnetic environment of a coil of wire will cause a voltage (emf) to be "induced" in the coil. No matter how the change is produced, the voltage will be generated. The change could be produced by changing the magnetic field strength, moving a magnet toward or away from the coil, moving the coil into or out of the magnetic field, rotating the coil relative to the magnet, etc.
Faradays law.