What is blue shampoo used for?

Blue shampoo is a type of shampoo that is specially formulated to counteract brassiness or yellow tones in blonde, silver or gray hair. It is typically colored blue, as blue is complementary to orange and yellow on the color wheel, which makes it the ideal tone to neutralize brassiness. Blue shampoo contains blue pigments that attach to the hair strands to cancel out yellow tints. It is often used by people with lighter hair colors who have undergone bleaching or coloring treatments that have caused unwanted warmth or brassiness in their hair. Blue shampoo is also recommended for those who swim frequently in chlorinated water, as chlorine can cause blonde or silver hair to turn green. Blue shampoo can be used in place of regular shampoo, or as a weekly treatment to maintain color. It is important to use blue shampoo in moderation, as excessive use can lead to a bluish tint in the hair.