The Moehair NN Series permanent hair color interacts with your hair's natural pigment and alters its structure without affecting the hair strands. The permanent hair color dyes are tiny colorless molecules helping easy color deposit. They penetrate the hair cuticle and create magic when they are combined with hydrogen peroxide and create a chemical reaction known as oxidation. Permanent hair color molecules become complex through oxidation and can embed themselves in the structure of the hair fiber. The result is what we call permanent hair color, or hair color that can withstand multiple washes. When applying permanent hair colors, it is important to take into consideration your hair type for proper results. Coarser hair, which has a larger diameter, takes longer to absorb color, whereas finer hair may absorb color more quickly. Since several factors influence timing, a strand test is required to estimate coloring time for future application.