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What causes haze on proof gold eagles?

My dad bought this 1995 $5 proof gold eagle this weekend but it has haze on both sides. I know silver gets haze but I didn't know that gold did. What causes it and can you safely remove it?
Thanks

Thanks

What Mr. Spock would say about numismatics...
... "Fascinating, but not logical"
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"Live long and prosper"
My "How I Started" columns