What can you use to get black nail polish out of a carpet?

You can try to use non acetone nail polish remover on it, wipe dry and repeat. Acetone will eat away at the carpet fibers. It probably won't come completely out of the carpet.

For the best result use this method.

1. Dab with nail polish remover, do not scrub it.

2. Sponge the stain with a household dry-cleaning fluid following the maker's

instructions. Do NOT soak. Open Windows and air the room thoroughly.