ONC Natural Colors Organic Hair Colour is a permanent hair colour that is ammonia & resorcinol free, with no parabens and is protein-based for natural-looking, healthier hair. Revolutionary hair colouring kit - natural colours Two-Step colouring process provides a natural, healthier choice for permanent coverage of grey hair. Salon developed, this process provides rich colour without the risks of Commercial, chemical-laden hair colour dyes. The unique process involves applying heat to open the hair's cuticles instead of unhealthy ammonia. Once complete, you're left with the smooth, shining, luxurious locks you've always longed for.