1N -Black can be used on the following colors to achieve a dark tone colour: 2N - 3N - 4N - 5N - 6N - 7N - 4D - 5D - 7D - 4M - 5M - 7M - 4R - 5R - 7R - 4C - 7C

1N - black hair with 5% grey hair - to achieve a 4M (Mahogany Chestnut) you must mix 45ml of 4M, l5ml of 1N black and 60ml of glycol to get a dark mahogany colour.

1N - black hair with 20% grey hair - to achieve a 4M (Mahogany Chestnut) you must mix 25ml of 1N, 35ml of 4M, 6Oml of glycol to get a dark mahogany colour. 

1N - black hair with 30% - 50% grey hair - to achieve a 4M (Mahogany Chestnut) you must mix 30ml of 1N, 3Oml of 4M, 60ml of glycol to get a dark mahogany color. 

1N - black hair with 60% -100% grey hair - to achieve a 4M (Mahogany Chestnut) you must mix 45ml of 1N, l5ml of 4M, 60ml of glycol to get a dark mahogany colour. 

This formula will apply for 1N black to be mixed with 4M as above or 4D (Golden Chestnut), 4R (Copper Chestnut) and 4C (Ash Chestnut). 

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