L'Oréal Dia Activateur II 15 Vol 4.5% Developer is a 15 volume (4.5%) cream developer specifically formulated for use with the Dia Color, Dia Light, and Dia Richesse demi-permanent color lines. Ideal for services requiring richer, more intense color results, it supports up to 70% grey coverage, tone-on-tone coloring, and creating visible tones in darker hair bases. The cream formulation allows for an even, easy mixture with consistent, uniform color and a radiant, glossy finish. Recommended for grey coverage (up to 70% white hair with Dia Richesse) and richer reflects in darker bases, it caters to all technical applications including virgin hair coloring, toning, lowlights, color refreshing, and fashion results. This gentle formula is free from ammonia, formaldehyde, and common allergy-causing preservatives. The 1L professional size is designed for salon use. For professional use only; not for home use. Mix with Dia Light, Dia Richesse, or Dia Color at a 1:1.5 ratio (50ml color + 75ml developer) and process for 2–20 minutes.