2006 TRI/PRINCETON CONFERENCE 403 9-1 Untreated frizzy hair at 50%RH 9-2 Untreated frizzy hair at 80%RH 9-3 PQ-10 treated hair at 50%RH 9-4 PQ-10 treated hair at 80%RH Figure 9. Images of PQ-10 shampoo-treated frizzy hair at different RH.

404 JOURNAL OF COSMETIC SCIENCE CONCLUSIONS • A new parameter-Hair Humidity Resistance Factor (H2RF) has been defined and can be determined by measuring changes in the remaining percent of hair elasticity at two levels of RH (50% and 80%) at different equilibrium time. • H2RF can be used as indicators of hair anti-frizz behavior as well as hair moistur- ization degree. • Addition of 1 % active Polyquaternium-70 into SH-1 shampoo improved its hair anti-frizz performance and demonstrated the best performance on hair humidity resistance among all tested shampoo samples • An Image Analysis method was used to evaluate anti-frizz performance of hair care products. The improvement in hair anti-frizz performance by addition of 1 % active Polyquaternium-70 into SH-1 shampoo system has been validated by image Analysis method. ACKNOWLEDGMENT The author thanks the application group of Croda Inc. for preparations of shampoo samples.