How do we dye hair brown with plant-based colour?
Plant-based dye works through transparency: it forms a sheath around the hair, applying a coloured "layer" over your natural colour. So you cannot go from one extreme to the other (from blond to black, for example).
If you have dark blond, light chestnut or auburn hair, you can achieve a light chestnut shade. If your hair is chestnut, light brown or coppery brown, you can achieve a darker shade of brown. Those with up to 30% white hair can also achieve a chestnut or brown colour. Any higher and your colourist will direct you to a lighter shade.
Is plant-based colouring as effective as chemical colouring?
Plant-based colouring is just as effective as chemical colouring: it is permanent and long-lasting with intense highlights.