Bleach London's Super Cool Colour is a semi-permanent hair dye designed for bleached hair. This at-home hair dye is perfect for revamping your look with over 15 available colours. One bottle is suitable for short hair or colouring freshly bleached and toned roots. For shoulder-length hair, two bottles are recommended. For hair longer than shoulder-length, three to four bottles may be needed. Extra bottles are recommended for very thick hair. This product is vegan and cruelty-free. The 'I Saw Red' shade is a bold, chic colour that lasts between 3-30 washes, depending on your hair's tone and porosity. To maintain vibrancy, consider using the corresponding toning shampoo and conditioner. Please note that this product is non-returnable for hygiene reasons.