Kenra Professional Permanent Coloring Creme portfolio consists of gentle, low-ammonia color is available in 74 shades with a level system ranging from 1 to 10. It is specially formulated for consistent, reliable results when used with Permanent Coloring Creme Developer 10 - 40 Volume.Kenra Color produces consistent, reliable results that stylists can count on to provide professional, true-to-tone hair color solutions on every client, every time. Like all Kenra Professional brands, Kenra Color is comprised of high quality, high performance products that are straightforward and easy-to-use. All formulations are created and tested by stylists. Cool Night Naturals NUA Collection (Natural Ultra Ash): Up to 100% Gray coverage Enable you to neutralize warmth at any level Calibrated at each level for optimal control and coverage Green/Blue base at lower levels for maximum neutralization. Gentle, low-ammonia color available in a wide array of multi-dimensional tones that deliver consistent, reliable results.• Features Balancing Complex 5• Provides vibrant, long-lasting results• Full gray coverage• Intense shine. How to use: • Mixing ratio: One-part Permanent Coloring Crème plus one-part Developer (1:1).• Standard Processing Time: 30 minutes. Processing time for gray coverage: up to 40 minutes.• Instructions: In a non-metallic bowl, mix one-part Kenra Color Permanent Coloring Crème with one-part Kenra Color Permanent Coloring Crème Developer 10-40 Volume (1:1). spray hair with Kenra Color Porosity Equalizing Spray and apply color. Process for 30 minutes/up to 45 minutes for gray coverage.