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Professional-grade treatment that temporarily deposits pigments to revive or enhance hair colour. This colour-enhancing treatment uses temporary pigments to bring out the best of your shade, helping to keep a rich shade vivid, take things down a notch or enhance your natural colour. "Boost" treatments add vibrancy for a colour pick-me-up and "Balance" treatments help tone down warmth or unwanted tones. The best part? It rinses out after a few washes and can be used up to twice a week. What it does: Enhances dark brunette colours for overall richness. Who it's for: Dark brunette to black shades.