This tip came from a professional artist.
You can re-balance the pH of the alkali in the material if you wash your hands with soap, then rinse well with a one-to-one solution of white vinegar and water each time. Rinse hands very well after the treatment to remove all vinegar from the skin.
Always use extreme caution when apply any treatment to hair, nails, skin or other parts of the body. Seek medical treatment for any reactions.