Pro Tip: Keep your limoncello yellow by mixing your Super Cool Colour with Reincarnation Bond Restoring Mask whenever your hair needs a boost. Reapply the Super Cool Colour as needed. Avoid using hot water when rinsing to preserve your colour. Effortless Hue: Generously applying it to clean, towel-dried hair. Leave it on for 30 minutes before rinsing. Make sure to follow all instructions provided. One bottle is perfect for short hair or coloring freshly bleached and toned roots. All BLEACH LONDON products are Vegan and PETA-Approved formulas. No bleach, ammonia or parabens. Formulated with Panthenol, Hydrolyzed Soy Protein and Wheat Amino Acids for shiny, silky soft strands. Our gentle semi-permanent Super Cool Colours are suitable for all hair types. Twisted Lemon Super Cool Colour works best on light blonde hair that's been toned with Champagne Super Toner for the punchiest of yellow. You had me at yell-o. Twisted Lemon Super Cool Colour is a gentle semi-permanent dye that turns bleached blonde hair a unique bright, zesty yellow that between 3-20 washes.