How do I cover black spots in a mirror?

Carol Smth
by Carol Smth

I have a beautiful medicine cabinet in the bathroom but black spots have set in around the outside edges. I've tried putting 1/2" pin stripping for cars in the shinny silver color around the outside edges of the mirror and it looked nice but it's not holding up. My question is..... does anyone know if I etched the outsides of the mirror about 1/2" all the way around would the etching be opaque enough to cover up the black spots or would they still continue to show through.

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