L'Oreal Hair Root Touch Up blends away grey with a natural and undetectable finish. Waterproof and doesn't transfer. Washes out in one shampoo. Roots are concealed in seconds.

Available in 4 colours to match all hair colours:

Dark Blonde, for blondes to dark blondes
Light Brown, for light browns to dark blondes
Brown, for brown hair
Black for black hair
Mahongany Brown for hair with warm tones