mu-metal discoloration and cleaning

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So, a few sheets of Ultraperm 80 arrived yesterday and I notice that it's discolored. Not a big deal as it's used inside an enclosure, but it's still unattractive. It appears as a rust color film across ~ 30% of the surface.

An externally hosted image should be here but it was not working when we last tested it.


Although the color appears embedded, I may just clean the surface for a coat of silver color paint. I wonder if anyone has experience cleaning mu metal.


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