For best results to achieve 4C (Ash Chestnut) on uncoloured hair is to apply on 4N - Chestnuts. If applied on 1N, 2N, 3N the result will be dark ash chestnut. If applied on 5N, 6N, 7N, the result will be ash chestnut.
Please note this colour is very cold and flat in tone. If applied on 4D, 5D, 4M, 5M, 4R, 5R. To cover grey hair is essential to mix appropriate quantity of 4N - Chestnut.
See instruction on leaflet inside the color box or refer to 4N - Chestnut