Figure 5. Hair color retention of brand shampoo with and without Quinoa Pro EX after repeated applications of color

Tests were run to assess the cumulative effectiveness in hair coloring and re-coloring using a brand shampoo to determine hair color wash out. Upon the first application of color, results showed 4% color retention improvement using Quinoa Pro EX versus control. Based on the second application of color, there was a 23% color retention improvement. Overall, studies clearly indicate stronger retention of hair color with continued use of Quinoa Pro EX.