True color depositing shampoos are primarily designed to achieve which effect?

True color depositing shampoos are specifically formulated to enrich the color of the hair by adding pigments. This type of shampoo is used primarily by individuals who desire to maintain or enhance their hair color between salon visits. It helps to restore vibrancy and depth to the color, preventing it from fading over time.

These shampoos contain color pigments that can either match the natural hair color or complement it, providing a refreshing boost to the overall hue. While other types of shampoos focus on cleansing the scalp, conditioning the hair, or addressing frizz, true color depositing shampoos are unique in that their main function is to enhance and enrich the hair's color through pigment application, making option B the correct choice.