2008 TRI/PRINCETON CONFERENCE 191 Figure 4. Deviation of the refl ected light at root-to-tip and tip-to-root orientations. Figure 5. Extraction of the shine and chroma bands from the specular profi le. the light hair to calculate apparent cuticle angle. Based on the fact that the shine band is white while the chroma band is colored, the processing on the specular profi les using RGB information allows separate the shine band from the chroma band (Figure 5). RESULTS AND DISCUSSION DATA REPRODUCIBILITY In order to examine the data reproducibility, we measured the hair shine values before and after treatments with a commercial shine shampoo for three blond hair tresses (Table I), dark brown hair tresses (Table II), and Asian black hair tresses (Table III). All these changes were signifi cant with 95% confi dence. Experimental results in Tables I–III dem- onstrate excellent data reproducibility and validate our test methodology. HAIR SHINE ENHANCEMENT BY COMMERCIAL PRODUCTS To determine hair shine enhancement by selected shine shampoo and conditioner, we carried out experiments using bleached, medium brown, dark brown, and Asian black

JOURNAL OF COSMETIC SCIENCE 192 hair tresses. The average changes in shine values of hair samples after the shine shampoo treatments are shown in Figure 6. It can be seen that this shine shampoo improved hair shine for all tested hair. Average hair shine indexes of treated hair tresses increased 9.4%, 9.8%, 12.4%, and 8.25%, respectively, for bleached, medium brown, dark brown, and Asian black hairs. The percent reductions in average cuticle angles of hair samples after treatment with this shine shampoo are presented in Figure 7. It is observed that the aver- age apparent cuticle angles of treated hair decreased 17.5%, 12%, 7.5%, and 10.9%, respectively, for bleached, medium brown, dark brown, and Asian black hair. All these changes were statistically signifi cant. The average changes in shine values of hair samples after the shine conditioner treatments are presented in Figure 8. Statistical analysis showed that there was no signifi cant improvement in hair shine after the conditioner treatment for both bleached and Asian black hair samples. ENHANCEMENT IN HAIR SHINE AND SURFACE SMOOTHNESS BY PBEM CONDITIONER Quaternium-91 (Q-91) conditioners with and W/O additional 2% PBEM were used to study its effects on hair shine and smoothness for bleached, blond, medium brown and Asian black hair samples. The compositions of these two conditioners are listed in Table IV. Table III Shine Values and Changes of Asian Black Hair after Commercial Shine Shampoo Treatment Shine value Hair sample Before After Change (%) Tress 1 42.1 47.0 11.5 Tress 2 44.6 47.8 7.06 Tress 3 42.3 46.7 10.3 Average 9.62 ± 2.30 Table I Shine Values and Changes of Blond Hair after Commercial Shine Shampoo Treatment Shine value Hair sample Before After Change (%) Tress 1 6.18 6.76 9.39 Tress 2 6.06 6.43 6.10 Tress 3 6.21 6.60 6.28 Average 7.26 ± 1.85 Table II Shine Values and Changes of Dark Brown Hair after Commercial Shine Shampoo Treatment Shine value Hair sample Before After Change (%) Tress 1 48.2 53.3 10.6 Tress 2 46.9 52.2 11.3 Tress 3 50.3 54.8 8.85 Average 10.25 ± 1.16