You can lighten your hair up to two tones with L'Oréal Paris's new leave-in gel. For the Natural Sunlight Effect on the Hair - The product, which has an ammonia-free gel formula and a pleasant scent - gradually lightens the hair with each use, allowing you to achieve a natural hair color as if it had been lightened by the sun. The gel, enriched with Camellia Oil and Care Factor, prevents and cares for your hair from damage during application, turning the application into a pleasant experience. The Lightening Process of Hair Color Happens Gradually. The product is applied to damp hair and dried with a dryer or direct sun. The hair nourishing rich content of this leave-in product helps the hair to become softer and shinier.