Garnier Nutrisse Ultra Color at home bold hair dye gives you nourished, vibrant, long-lasting hair colour. The exclusive colour boost technology boots your colour by infusing intense dyes at the heart of the fibre, for up to 8 weeks of intense bold colour. Choosing your perfect Nutrisse shade: Your hair dye colour result will vary depending on your natural hair colour – check the back of pack. If you are deciding between 2 shades, always choose the lightest. Remember to always do your patch test 48 hours before colouring your hair at home.