For consistent results, especially when covering gray regrowth, a methodical application is key. Start with clean, dry, un-styled hair. Divide your hair into four main sections (part down the middle and from ear to ear). Clip three sections away. Working with one section at a time, use the applicator bottle or a tint brush to apply the color mixture, beginning about half an inch away from your scalp on the first subsection. Once that subsection is saturated, immediately apply the mixture to the roots of that same subsection. This technique, often called "root-to-midshaft then ends," helps ensure the more porous ends (which process faster) don’t become over-lightened while the roots (which process slower due to body heat) catch up.
Gray or white hair can be more resistant to color because it lacks natural pigment. To help the color take evenly, make sure the mixture is applied very thoroughly and generously to these areas, massaging it in to ensure every strand is coated. The creamy texture of this product is noted for helping spread the mixture without patchiness. Do not skimp on the amount used. Follow the development time listed in the instructions exactly, but be aware that stubborn gray may require the full, maximum recommended time. Always perform a strand test 48 hours before full application to check for both color result and sensitivity. If you have a lot of gray or very resistant hair, using a color specifically marketed for maximum gray coverage or consulting a stylist for technique may provide a more reliable outcome.