JustForMen Shampoo-In-Color #DarkestBrownLong-Lasting – Will not wash out; Lasts up to 8 weeks until the grey grows back; We know every man is different so our hair coloring product is here when those grey hairs begin to grow backFast & Easy – Pour color base into applicator bottle. Shake & apply. Works in 5 easy minutes. Follow all instructions on the enclosed leaflet. Perform a skin allergy test 48 hours before use, and always use the gloves provided to avoid stainingIt is recommended for normal use