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Looks like a surface etching. But then again I never actually had a W&B CHG in my hands, hard to judge, you'll get better advice.

As for myself, I wouldn't touch it. Or, worst case scenario, I...

Depends of the depth of the etch, really. When working with felt or cotton wheels and polish compound, or with micro mesh for example, you won't brush enough metal to reach the etching in most cases,...