Revlon Professional Revlonissimo Colour Excel Tone On Tone Hair Dye offers a sophisticated way to enhance your hair's natural color with a subtle, tone-on-tone effect. This ammonia-free formula is designed to provide vibrant, long-lasting color while maintaining hair health. It works by depositing rich pigments onto the hair shaft, offering excellent coverage for up to 50% gray hair and adding a beautiful sheen. The shade 2.10 Black Blue delivers a deep black base with cool blue undertones, perfect for achieving a nuanced, multidimensional dark look. Its creamy texture ensures easy and precise application, making it suitable for professional salon use or at-home coloring for those seeking salon-quality results.