INOA — Innovation No Ammonia — is L'Oreal Professionnel's ammonia-free permanent colour. It's used for permanent colour and up to 100% grey coverage with a gentler, odour-free service, making it a popular choice for sensitive scalps and clients who dislike the smell of ammonia.

INOA mixes 1:1 with INOA Oxydant — equal parts colour and developer. Always use INOA Oxydant rather than a standard developer, as the ODS2 oil-delivery system is what carries the colour and makes the ammonia-free formula work.

Yes — INOA gives up to 100% grey coverage and up to three levels of lift, with even, long-lasting, natural-looking results.

Both are L'Oreal permanent colours with up to 100% grey coverage. INOA is ammonia-free and uses an oil-delivery system for a gentler, odourless service, while Majirel is an ammonia-based crème with an extensive fashion and high-lift palette. Many salons use INOA for sensitive clients and Majirel for creative colour.