You control how much grey you lose, gradually. grecian you decide: day by day grecian gradually restores your natural-looking colour. You can stop any time and leave a little grey, or keep going until all the grey is gone. How grecian works: grecian has the unique ability to replace lost melanin with a similar-acting pigment, Different hair colours are the result of different amounts of melanin, nature's colouring protein, Hair looks thicker, healthier: grecian has special conditioning action. Even makes hair easier to comb and style. Grecian works for any colour hair: see in picture Grecian penetrates hair, deep inside where natural colour begins