Ardell Gray Magic is a unique way to cover resistant gray hair, and bring vibrancy and intensity to ALL hair color. Gray Magic Color Additive can be added to ANY color formula to achieve vibrant color and exceptional gray coverage. Formulated to help hair color penetrate deeper into cortex. Is also great for toning down ash (green) tones. Adds "punch" to red hair color formulations and helps to alleviate chlorine discolorations. Gray Magic work works because gray hair is the result of the loss of red and yellow color pigment. Gray Magic adds concentrate red and yellow with wetting agents to replace the lost color pigment and moisture, to 'lock-in' hair color. When added to shampoos or conditioners, will prevent fading and oxidtation for tinted red or warm colors (10 drops per ounce of shampoo or conditioner).