INOA rich Developer 20-Volume is totally stable and buffered to ensure consistent and uniform color results. It’s creamy, made formulas supply mild, controlled lightening and coloring action. INOA, our first ammonia-free permanent technology, revolutionized the hair color trade with a breakthrough ODS² Oil Delivery System. Directions: INOA should be used exclusively with INOA Hair Color Systems The mixing ratio is 1:1 Development time: 35 minutes