Schwarzkopf Chroma ID is a semi-permanent mix and tone colour system with integrated bonding technology. The Chroma ID Bonding Color Masks are perfect for at-home colour refresh and pastel toning to help maintain colour vibrancy between salon visits. Use shade 6-88 Ruby for red tones and refreshments on dark blonde bases. Colour & Care in 1 Step: Combining high performing colour with intense care: the treatment based colour allows for simple, quick and perfectly even colour distribution while the integrated bonding technology deeply conditions the hair from within. Easy Application: Apply evenly onto pre-washed, towel dried hair. Leave on for 3-15 minutes, depending on desired colour vibrancy, then rinse. Simple! Longevity: Depending on shade selection, development time and hair structure, colour lasts 5-12 washes. Technology: The low salt technology leads to maximum pigment availability in the hair for enhanced colour results while the integrated bonding technology enforces structural bonds in the hair shaft for increased hair strength. Click Here to find out more about the Chroma ID Colour System. Click Here to see the Chroma ID Colour Guide.