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Message:: [QUOTE="GDJMSP, post: 25295608, member: 112"]Yes. The amount of time it will take is variable but it will happen. And the color of the new toning will almost certainly be a different color in that area. "Fill" is perhaps a poor choice of words to use in this case as it could easily be misconstrued by readers to mean fill in, make even with the surrounding surface. And that doesn't happen. The newly exposed metal is simply toned, has its color changed. It doesn't really hide them, as in make them impossible to see, but yes it can make them more difficult to see. But a trained eye can see them with no magnification at all. While an untrained eye probably will need magnification to see them. Your comment is correct in the general sense. But each individual is different when it comes to their choice of magnification for grading and or attribution. For grading some might use 5x while others might use 7x. And typically magnification is only used for the highest of grades, 69 and 70, but 5x is what is stipulated. All other grading is done with the naked eye. Unless of course you "think" you might see something and need to confirm or deny it. For attribution 10x is usually all that is ever needed and even then only in select cases. But there are those who prefer to use say 70x microscopes. As I said it's a personal choice.[/QUOTE]