ok it is great it works but [SEP] i did the sample test on my husbands arm and after hours it was tough to come off after scrubbing it literally turned into a rash over days and had we waited the full hours we would have known it would be the same on his beard there is a note that states the product could be irritating if left on the skin but how are we supposed to know if it will work if we do not try it first he likes the grey covered as it is not evenly spaced out naturally however the color does work just follow the directions but it irritated his skin we have tried all kinds of products and they all are irritating except the natural products that are also available in the end it does work it is just not for us