Do a simple strand and spot test. Mix a small amount of the product and dye some harvested hair from your comb or brush. And locate a safe place on your skin (behind ear, forearm) to spot test the skin. Remember, make the sample the consistency of ketchup and wait the appropriate transition period to truly see the actual final product (48 hours). Skin problems/irritations rarely occur. If any should occur, do not continue with the hair/beard dye application.