If the ink is still too thick, add two more drops of the nail polish remover.

If it is still too thick, add two more drops of the thinner. Be sure to close the bottle and shake it before testing the ink again. You may also find the thinner labeled as “correction ink thinner” or “correction fluid thinner. "

Draw circles with it in a small puddle of olive oil or baby oil. Soak the tip in a cup of warm water for about 10 minutes.