This Sanotint hair dye formulation, identified as Dark Copper Classic 4% PPD No Ammonia Dye No. 29, offers a sophisticated coloring solution tailored for lasting results. It is designed to provide rich, copper tones while adhering to a low-ammonia policy, contributing to a gentler coloring experience for hair. The inclusion of 4% PPD indicates a standard level of oxidation dye concentration for effective color deposit and longevity.