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[Goaty]

manganese dioxide (MnO)

Sorry - my poor typing skills!

Manganese Dioxide should have the formula MnO2.

Magnesium Oxide is a monoxide with the formula MgO.

[Finderskeepers]

Found mylar foil to work very well. Recently used nickel spray paint to reshield a Coiltek mono coil and works well on my GPX4500 - no problems ground balancing and no loss in sensitivity. But a very thin layer is to be applied.