42 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS 30 25 2O % lO 5 o 250 300 350 400 450 500 550 600 650 700 750 WAVELENGTH [NM] average- stdv. i average m average + stdv. 12 ................................ 10- 8- 6- 4- 2- ß 1111111111111111111111111111 I 250. 300 350 400 450 500 550 600 650 700 750 WAVELENGTH [NM] EE3 relative stdv. Figure 3. Intraindividual variation coefficient spectra recorded with the 1% transmission filter of the instrument (stdv. = standard deviation). nm, parallel to increasing numbers of cyanoacrylate strips removed from skin. Reflec- tivity in the range of 300 nm is decreased less, and the decrease is barely visible in the range of 350 nm (Figure 7). An analogous behavior is observable after removal of tape strips.

HUMAN SKIN UV/VIS REFLECTION SPECTRA 43 50 •9. a = mean + standard deviation • b = mean remittance f,.) 40 c = mean - standard deviation 30 - 20- _ 25O lø I 300 350 400 450 500 WAVELENGTH [NM] Figure 4. Interindividual variations of untanned lower forearms. 550 6OO o _ -5- -10 250 275 300 325 350 375 400 425 450 475 500 525 550 WAVELENGTH [NM] Figure 5. Variation coefficient of data illustrated in Figure 4 (assuming linear and normal distribution).