The M (Mahogany) shades are formulated to offer a more customized color. Thanks to a consistent and odorless formula, Herbatint Hair color Gel is easy to mix and apply, proving perfect results in just 40 minutes. Herbatint's gentle formula allows you to lighten your natural hair color up to a maximum of 2 shades. Benefits: Ideal to add brown and natural red highlights to dull hair Enhances your hair with a light reflecting and healthy shine Gentle formula without ammonia, resorcinol, parabens and alcohol fragrance free How to Use: To mix Herbatint Gel and Developer use a plastic or glass measuring cup Mix with a brush until you obtain a gel-like consistency. Starting at the root, apply the gel to dry, unwashed hair. Leave the gel on for 40 minutes. Rinse thoroughly until the water is completely clear. Tilt your head back while you rinse so that the gel does not get into your eyes. Immediately shampoo your hair after rinsing.