How do I fix discoloration on a metal plaque?

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I bought this Amazing Grace metal wall plaque at Bed Bath and Beyond and not sure how these discolorations happened. I tried a Sharpie but that didn't work. Would scraping the paint off the whole plaque work? I know the result would be a different color plaque but maybe without the discolorations?

q how do i fix discoloration on a metal plaque
q how do i fix discoloration on a metal plaque
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