What determines the efficiency of true color depositing shampoos designed to refresh hair color?

The efficiency of true color depositing shampoos in refreshing hair color is primarily determined by the existing hair color level. This is because the success of the shampoo in depositing color relies on the hair’s porosity and its current shade.

Each hair color level has a unique base that reacts differently to color treatments. For instance, lighter hair can absorb color deposits more effectively than darker hair levels, where existing pigments may interfere with the new color. Additionally, hair that has been previously lightened or treated may have a different pH and porosity that allows for better absorption of the pigments in these specialized shampoos.

While the type of shampoo and the amount of product used can influence the outcome to some degree, it is fundamentally the existing hair color level that dictates how well the pigments from the shampoo interact with the hair. Age is less relevant in this context, as the hair color level is a more critical factor in determining the efficacy of color depositing shampoos. Thus, understanding the current state of the hair is essential for achieving the desired color refreshment outcomes.