How do henna and indigo work together to create this specific dark brown shade?

This product utilizes a dual-plant powder system where Lawsonia inermis (henna) provides warm copper-brown pigments, while Indigofera tinctoria (indigo) shifts the overall tone toward a deeper, darker brown. Unlike conventional oxidative dyes that penetrate the hair cortex to permanently alter the natural pigment, this botanical formula works by coating the hair shaft. The finely milled powders form a colored paste that adheres to the surface, adding visual density, softness, and shine. Because the color settles around the hair rather than chemically restructuring it, the final shade is not uniform across all users. It depends heavily on your starting hair color, the porosity of your hair, and any previous coloring history. For those with natural brown hair, this combination helps revive faded lengths and make the tone look fuller. However, because it is a plant-based coating rather than a chemical lift, it cannot lighten hair; it only deposits color and enhances existing tones.