Products designed to counteract unwanted yellow or brassy tones in blonde, gray, or silver hair often utilize color theory. These hair care items deposit complementary pigments to neutralize those warm shades. The formulations employ violet or blue-toned pigments to achieve the desired color correction.
These specialized shampoos are valued for maintaining the brightness and vibrancy of treated hair. They help extend the time between salon visits for color correction. Historically, homemade remedies using violet dyes were employed before commercial products became widely available.