2006 TRI/PRINCETON CONFERENCE 401 7-1 Untreated frizzy hair at 50%RH 7-2 Untreated frizzy hair at 80%RH Hair type *CSD, µm (Average) Ellipticity Shape of hair shaft Shape Figure 7. Change in the appearance of a frizzy hair sample. Table II Shape and Ellipticity of Different Types of Hairs Caucasian Black Oriental 29-96 (70) 46-120 (90) 36-125 (92) 1.17-1.41 1.68-1.98 -1.25 Oval Flat Round Straight to Wavy to Straight to wavy/curly very curly wavy * CSD: Cross-sectional diameter. Hispanic 30-120 (70-92) 1.17-1.98 Oval-flat-round Straight/wavy to very curly after treatment with a PQ-70-containing shampoo. Before the shampoo treatment, the hair tress became volume-expanded and curlier when the RH increased from 50% to 80%. After the shampoo treatment, the changes in hair volume and curvature were reduced. Figure 9 shows images of a frizzy hair tress at 50% and 80% RH before and after treatment with a PQ-10-containing shampoo. Before the shampoo treatment, the frizzy hair tress became volume-expanded and curlier when the RH increased from 50% to 80%. After the shampoo treatment, the changes in hair volume and curvature with an increase in the environmental humidity did not show any improvement. Comparing theses images, it can be concluded that the PQ-70 shampoo did show better anti-frizz performance compared to other tested shampoo formulations.

402 JOURNAL OF COSMETIC SCIENCE 8-1 Untreated frizzy hair at 50%:RH 8-2 Untreated frizzy hair at 80%RH 8-3 PQ-70 treated hair at 50%RH 8-4 PQ-70 treated hair at 80%RH Figure 8. Images of PQ-70-shampoo-treated frizzy hair at different RH.