Figure 4. Hair color retention comparing commercial conditioner with Quinoa Pro EX vs. (control) commercial conditioner

Hair was washed a total of 15 times, followed by treatment with conditioner after every five washes (three treatments with conditioner total). Comparing Agent #1 against Agent #2, TRI-K results show there was a 10% improvement in color retention by adding Quinoa Pro EX based on ∆E*ab (C).