Global Keratin Gkhair Developer Vol.20 1000

GK Developer created for use with the Oil Hair Color series.

This amazing cream promotes color adherence and optimal application. Designed to work as a complete system. The level varies depending on the color, providing up to 4 levels of permanent or semi-permanent color. Designed to work with all Oil Hair Color, Blond Highlift, and lightening oil colors.

Use the 10 level developer for one level of color.

Use the 20 level for two levels, or to cover gray hair.

Use the 30 level for three levels of color.

Version 40 allows you to achieve 4 levels of blonde coloring with the Blonde Highlift series.