No, it would not be visible at all. it's a microlayer of material. When you remove it though, you will see that the underlying rotor metal is much lighter in color. makes it easy to tell if you've missed a spot because it will be darker.
Again, the race pads method is the easiest, but also the most expensive.
And FYI just so you know what to look for, glazing on pad makes them *very* shiny. Almost like glassy looking. Sometimes it's easy to mistake a well-worn pad with a glazed one. Just for future info.
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