72 - C Q) � Q) Q. 0 -E ( Q) u C'!I 't: ::::, CJ) J!! C ::::, 0 0 C � u Cl) 'ii 0 .c D.. "D Cl) C'I E 0 z 78 76 74 72 70 68 66 JOURNAL OF COSMETIC SCIENCE -+---- 3% Peroxide, Neutral pH --- 3% Peroxide, pH=9 -.--- 3% Peroxide, surfactant, pH=9 �------------------------------. � 64 --1------.-----.----,-------,-------r------,-----,------,-----,--- 0 5 10 15 20 25 30 35 40 45 50 Bleaching time, min. Figure 4. Total surface carbon content in response to various bleaching treatments. I---+- Blank ----3% Peroxide, Surfactant, pH=9, 45 min. I 292 290 288 286 284 Binding Energy, eV Figure 5. Overlay of C(ls) spectra from blank and bleached hair. ,P 282 • 1 1 rj: 280 The amount of carbon detected at the surface decreases on a percentage basis due to the great increase in the amount of Si present. The chemical states of the carbon present are seen to change relative to the bleached surface due to the adsorption of the dimethicone

HAIR SURFACE CHEMISTRY 73 ---+---3% Peroxide, Neutral pH ---3% Peroxide, pH=9 ---½-----3% Peroxide, Surfactant, pH=9 1.4 1.3 'E 1.2 GI u :ii 1.1 E � 4: 0.9 ,:! :::1 0.8 Cl) 0.7 0.6 0 10 20 30 40 50 Bleaching time, min. Figure 6. Surface oxidized sulfur content after various bleaching treatments. WD=20.5mm Time :9:20:25 Figure 7. SEM image of bleached hair fibers (3% hydrogen peroxide, 45 min., pH = 9, with surfactant).