The Schwarzkopf Goodbye Orange Shampoo neutralizes unwanted undertones in medium brown to dark blonde hair. The shampoo intensifies cool tones by counteracting underlying orange and red shades. A combination of blue and green direct dyes provides effective and long-lasting neutralization of unwanted orange and red undertones while gently cleansing. The shampoo helps to hair is nourished and strengthened. How to use: Goodbye Orange is recommended for hair bases 4 to 5 with red and orange undertones. It can also be used to tackle underlying orange tones on base 6. The shampoo is applied undiluted to wet hair and left in for up to 5 minutes. Use 1-2 times per week for tonal maintenance.