292 0.12 0.10 0.08 rn � 0.06 · 0.04 0.02 0.00 0 0.07 0.06 0.05 ::::, rn 0.04 � · C: 0.03 Q) c 0.02 0.01 0.00 0 JOURNAL OF COSMETIC SCIENCE A � coconut oil 2 min. '' T-R ,, ,, II I I 1,1 coconut oil 2 min. 'I \ R-T I, ,t, I 1/ • I I � untreated R-T/\ 1/ :\ untreated T-R __J1 I I ,, I / 1,1\ 20 40 60 Scattering angle (degrees) B coconut oil 24 hrs. T-R coconut oil 24 hrs. r R-T ( 80 \ ,, I untreated T-R untreated R-r, I ,. I I I r' I \ I' \ I I I I \ I \ I I \ -�--��-....... 20 40 60 80 Scattering angle (degrees) Figure 7. Goniophotometric intensity scans: (A) Individual untreated Indian hair fiber and immediately after coconut oil application. (B) 24 hours after coconut oil application compared to untreated fiber. (C) 24 hours after coconut oil application with short-term heat treatment. (D) After removal of oil film with acetone. tional heat treatment. Also, for hair treated with sesame, ricebran, and olive oils, the scale structure was not apparent from the GP curves even after 24 hours, suggesting no penetration. For olive oil, however, partial separation of reflectance patterns from the

0.025 0.020 :::::, 0.015 co � ·en 0.010 0.005 0.000 0 0.05 0.04 ::J ro o.o3 ·oo � 0.02 0.01 0 PENETRATION OF OILS INTO HAIR FIBERS C coconut oil 24 hrs. w. heat T-R ¼ R-T /"�··/ I I I I I I I j 20 40 60 Scattering angle (degrees) I\ oil removed I\ R-T I 20 I I I I I I 40 D oil removed T-R 60 Scattering angle (degrees) Figure 7. Continued. 293 80 80 T-R and R-T positions appeared after additional heat treatment. Surprisingly, for hair treated with sunflower oil, the scale edges were partly exposed after 24 hours, indicating at least partial penetration of sunflower oil into the fiber. As GP scans characterize only