The color pigments used in most color lines today are large molecules called "macro" molecules. Hair color then utilizes agents to open the hair shaft to deposit the color pigment. Because the molecule is so large, the hair shaft has to be opened more, to deposit the pigment. The ingredients that are used in the opening process is what causes most of the damage and scalp irritation during the color process. If the color molecules were smaller, the hair shaft would not need to be opened as far and; therefore, far less of the damaging ingredients would be needed. Advanced Coloration refines the color molecule further than ever before to a "micro" molecule state, requiring nearly none of the damaging ingredients. This allows the hair shaft to remain more intact; therefore, leaving the hair in far superior condition and the scalp healthier.This is High Definition technology. Imagine how much more vibrant your hair color can be with so many more color molecules occupying the same space.