For best results to achieve 4R (Copper Chestnut) on uncolored hair, apply on 4N - Chestnut color hair. If applied on 1N, 2N, 3N, the color result will be dark coppper chestnut. If applied on 5N, 6N, 7N, the color will be light copper chestnut. The same rules will apply for 4D and 4M, 4C. To cover grey hair with 4R it is essential to mix appropriate quantity of 4N Chestnut.
See instruction on leaflet inside the color box or refer to 4N Chestnut.