Since I type a lot, I like my nails to be short. But I find that emery boards don't last very long. Before I've finished polishing a single hand, it seems that portions of the board are dull. There's nothing more frustrating than trying to file your nails with a bit of smooth cardboard.
It would be great if you could *see* the parts of the board that were still good. It seems to me that, if we simply colored the sand differently from the board, where the sand wore off, the color would change in that location. So you could easily see where the sand was still present.
You're welcome.
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