Color stuck on back glass

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Hello, I have removed the back glass of an s6 edge for a battery repair and the back glass gold color leaves marks on the glass. I have tried to heat it up and remove it with Alcohol and acetone and also tried to scratch it off but nothing has worked.

I did the same battery repair on a flat S6 and it came out smoothly without any problems or marks. is there a way to remove it?

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