The Schwarzkopf IGORA ROYAL E/MIX 0-77 Copper Concentrate is designed for professional mixing with other IGORA ROYAL shades to intensify or customize copper tones in the final hair color result. This professional additive allows colorists precise control over vibrancy and tone adjustment, ensuring a highly customized and long-lasting copper effect. It is formulated to integrate seamlessly with the primary hair color selection for superior color fidelity.