An at-home semi-permanent hair dye for bleached hair. Bleach London’s Super Cool Colours are perfect for revamping your hair with over 15 semi-permanent colours to choose from. One bottle is suitable for short hair or colouring freshly bleached and toned roots. For shoulder length hair you'll need two bottles. For long hair that's below your shoulders, you'll need three to four bottles. If your hair is very thick, an extra bottle is recommended. This hair dye is vegan and cruelty-free. Transform blonde hair into a dreamy barbie pink that lasts between 3-30 washes.