48 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS 160 140- •120 •100 40 .)? '.x - - x!.' 7.. 250 265 280 295 310 325 340 WAVELENGTH [NM] Figure 12. Normalized spectra of lower forearms after washing with tap water (a•t = 10, 20, 30, and 40 minutes after treatment). 210 - 190- 170- 150 130- 110- 90- 70- 50 250 275 300 325 350 375 400 425 450 475 5( )0 WAVELENGTH [NM] Figure 13. Normalized spectra of lower forearms after washing with soap (a•t -- 10, 20, 40, and 80 minutes after treatment).
HUMAN SKIN UV/VIS REFLECTION SPECTRA 49 210-- 190- -- a •170 b 150 - c 130 110 70 250 265 280 295 310 325 340 WAVELENGTH [NM] Figure 14. Normalized spectra of lower forearms after washing with SDS solution (a-d -- 10, 20, 40, and 80 minutes after treatment). 180 160 140 120 100 ,,• a = 2 days use of products •l" ".• b = 7 days use of products ,v, .. ,,Md• c = 9 days use of products ,' .: ".. ",,Q•,_ d = 14 days use of products r,/ • ". • ''', .'7-..'-' .-'."•" . ,". ' ', •-.".'. • :, ,:':.-,:" _."L'•".".', ,..-z.,. // -- x .) (.•.•.' • '.' ...• '• x,-','. ,,I.' '. % . .ø / % / \.' ' /' • ". / \," / 60- 40 275 325 375 425 475 525 575 WAVELENGTH [NM] Figure 15. Normalized spectra after repeated, frequent washing with soap (a• = 2, 7, 9, and 14 days of excessive treatment).
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