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How can magnetic nail polish stay magnetic after it dries?

I learned that it does not stay magnetic after it dries because the magnetic particles aren't able to move since they're surrounded by dried nail polish.

So... Would you have to add more iron oxide to make the magnetic field stronger? Or would you need a very strong magnet to draw the iron oxide in the nail polish out?

How would you make magnetic nail polish so that it stay magnetic after it dries?