Klorane Centaury Shampoo for Gray, Blonde Hair is a shampoo that protects white or greying hair from the yellowing process. It works to restore balance and radiance to your hair by adding silver highlights, due to the cyanocentaurein in contains. Klorane Centaury Shampoo for Gray, Blonde Hair works to protect white or greying hair from the natural yellowing process. It contains the active ingredient Centaurea, which is a harvest plant most commonly seen in Europe and Western Asia. Centaurea flowers are harvested when they bloom, and are then dried in the shade to protect their original colour. The Centaurea extracts that are obtained from the dried plants contain a natural bluish colouring agent which is known as cyanocentaurein. When used in Klorane Shampoo, this colouring is only a highlight and does not work from the roots. This shampoo is paraben free, hypoallergenic, and does not contain any synthetic colouring agents.