Figure 7. Red hair color retention (after 10 washes) using red hair color dye with Quinoa Pro EX vs. (placebo) red hair color dye

Retention of the red color was also measured after a period of 10 washes measuring placebo vs. placebo + 1% Quinoa Pro EX. Based on da*(C), red color stay resulted in 20% better red color retention vs. placebo alone.