One N Only Argan Oil Hair Color Chart. There are nine distinct colors in the series including 1n (very black), 2n (black), 3n (dark natural brown), 4n. The natural series comprises of tones that can provide maximum gray coverage.

There are nine distinct colors in the series including 1n (very black), 2n (black), 3n (dark natural brown), 4n. The natural series comprises of tones that can provide maximum gray coverage.