Stuck the top of my head into some wet POR-15, did not know it until way too late....well, it certainly eliminates the gray...and I expect it will for some time. So, if you are graying and your youthful color was black, give POR-15 a try.....it also makes it real stiff so other hair care products may not be needed, money saved for use on SHO-things. Bob "lookin' damn good" Bade 93 MTX