Gentle, tone-on-tone gel coloring works lightly and gently, enhancing natural color and masking early white hair. Glow Gel's acid pH technology acts only superficially while respecting the nature of the hair as much as possible and gives a boost of shine. The 42 shades are mixable with each other and can also be used in combination with Glow Cream and other Cotril colorations. Dilution 1:1.