This little hot water bath brings the polish back to life, allowing you to get every last drop out. When your polish gets too thick or dry, you can also add a few drops of nail polish remover.
Apply petroleum jelly to any place where the dye might touch your skin (forehead, behind the ears, back of the neck). Dye your hair as usual. The petroleum jelly stops the dye from staining your skin. Wash it off when you’re done.