What effect does a quasi colour do to the hair structure?

The effects of quasi-permanent colour The quasi-permanent colour is mixed with a low-volume oxidant (1:2 ratio). Different sized colour molecules enter the cortex and are oxidized by the oxidant. Because the oxidant is mild, the colour molecules do not become very large and are gradually lost each time the hair is shampooed. The colour is designed to fade over a period of 12 weeks.