What it is: Ultra-rich formula. Creamy consistency. Easy, pleasant application. For use with Goldwell Nectaya Ammonia Free Hair color. What it does: Ultra rich formula for the exclusive synergy with Nectaya Nurturing Ammonia free permanent color. What else you need to know: Nourishing developer lotion. Ultra-rich formula. Creamy consistency. Easy, pleasant application. For use with Goldwell Nectaya Ammonia Free Hair color. Comes in 3% (10 vol), 6% (20 vol), 9% (30 vol) and 12% (40 vol).