Hair Mask specifically formulated with color pigments to neutralize unwanted tones or enhance silver reflections while nourishing the hair, restoring healthy porosity and making it softer and silkier. Works best on yellow, pale yellow, gray and unpigmented hair leaving an icy pearl gray on platinum bases and naturally neutralizing yellow bases. On hair with intense yellow or gold underlying pigment obtain a natural ash tone. On hair with light yellow underlying pigment obtain natural ash to gray ash depending upon processing time. On hair with very light yellow underlying pigment obtain cool ash gray to very silvery gray tones depending upon processing time. The intensity of gray increases when you increase processing time.