Goldwell Topchic 6B Goldwell Topchic permanent hair colour delivers maximum color accuracy with efficient product dosing and processing time for a quick, convenient and protective coloring service. Goldwell's Topchic's patented Coenzyme Technology protects the hair during coloration, and neutralizes free radicals which can cause over-oxidation. The Color Equalizer System homogenizes the hair structure for a more even color result and smoothness with improved compatibility. 2.1 oz.