Shampoos marketed as "green" are hair care products specifically developed to neutralize unwanted red or orange tones in red hair. An example of such a product is Celeb Luxury Viral Colorwash, which utilizes green pigments to counteract the brassiness that can develop in red-pigmented hair.
Green shampoo for red hair plays a significant role in hair care by preserving the vibrancy and desired tone of red hair. Its benefits include color correction, brassiness removal, and hair strengthening. The development of green shampoo can be traced back to the early 20th century, when hairdressers began experimenting with color theory to combat the fading and discoloration of red hair dyes.