Hair Darkener for Men. GEN's Hair Darkening Cream. Natural Black. Wonder Hair Color. All-Natural and Permanent. 12 Oz. Hair at its Prime with Free 2-day Shipping. is an astonishing formulation that progressively darkens men’s grey hair to a natural black, permanently. It quickly smoothens and polishes the hair with its advanced moisturizing properties, leaving the hair feeling soft and shiny and healthy. GEN's Hair Darkening Cream for Men, Black, A Wonder Hair Color. All-Natural and Permanent. 12 Oz. Hair at its Prime, quickly transforms the hair to a healthy and luxurious natural black color within a space of 7 days, depending on your hair type. Consistent use of GEN’s hair darkening cream ensures uniform color throughout the hair and usage can be reduced to twice or thrice weekly or less, after desired shade is attained. Facts: Holds: 12 oz. Cream Intended Use: 100% Total Grey Coverage Composition: Organic and All-natural, Free of Harsh Chemicals Perfect For: All hair types