No-ammonia hair color is a type of hair color that does not contain ammonia in its formulation. Ammonia is often used in traditional hair colors to open the hair cuticle and allow the color molecules to penetrate and change the hair's natural color. It has a strong, unpleasant odour.No-ammonia hair color contains alternative ingredients like alkaline agents to achieve similar color results without the need for ammonia. This can make the coloring process gentler on the hair and scalp, with less potential for damage, dryness, or irritation. No-ammonia hair color is a preferred choice for individuals with sensitive skin or those looking for a more comfortable and odour-free coloring experience.