Redken Color Gels Lacquers 10 Minute 4NN Black Coffee Permanent Hair Dye 60ml contains an innovative permanent color technology that offers up to 100% of grey coverage in just 10 minutes. With a high saturation and a lacquer-like shine, this product offers the same results in less time. Its composition is perfect for fast root retouches services or coverage in less than eight weeks, with up to one inch of regrowth. Moreover, the Redken Color Gels Lacquers 10 Minute contains Smart Pause Technology, a system that helps to prevent overprocessing. Therefore, the color results will be virtually the same even if you leave the formula to process for up to 15 minutes. As a last note, this coloring solution is compatible with the Redken Pro-oxide Cream Developer. For best results, use 20 volume. Characteristics Color: 4NN Coffee Grounds; Requires only 10 minutes of processing time; Provides up to one level of lift; Ideal for root retouches or coverage on up to one inch of regrowth; Ensures 100% of grey coverage; Contains Smart Pause Technology, a system that helps to prevent overprocessing; Compatible with the Redken Pro-oxide Cream Developer. Precautions DEVELOPED FOR PROFESSIONAL USE ONLY. How to use This product was developed for professional use only and should not, therefore, be used at home. Mix Redken Color Gels Lacquers 10 Minute 4NN Black Coffee Permanent Hair Dye 60ml with the Redken Pro-oxide Cream Developer. Use a 1:1 ratio. Apply using either a brush or a bottle to the desired areas and with the suitable technique. Allow the hair dye 10 minutes to process on the hair at room temperature, then rinse thoroughly.