Quite a good product if you want to darken your gray hair. I searched for it because a client asked for it at the salon. I applied it myself on his hair after the haircut to see if it's worth it. Indeed, the overall result darkened, but I don't know about the hold because I applied it on wet hair, so I don't know how it held once it dried. I gave it 4 stars because with incorrect application, the result may not look very natural. You shouldn't use a large amount and the product should be distributed evenly to avoid leaving black patches.