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Black coating on mu metal

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I am searching for a supplier and /or information for a black coating/plating on mu metal. The parts are small (.500 dia. or less),and will operate at - 200 degrees C in liquid nitrogen. The coating or plating can not alter the shielding properties of the material. The application is an optical device. Any information regarding this inquiry will be helpful.

Aaron Krieger
Machine Shop - Stuart, FL, USA

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