The spectral behaviour of sunscreen B is reported in Fig. 2 and in this case too the spectral profiles and performance are similar regardless of whether the sunscreen was spread on glass, full-thickness pig skin or pig/human SCE membranes. Slightly lower absorbance levels were detected from the glass slides in accordance with what was observed and discussed above for sunscreen A. However, strikingly different from sunscreen A is its remarkable photostability throughout the whole UV range. Although this sunscreen contains BMDBM which is known to be inherently photounstable (Schwack and Rudolph, 1995), it is sufficiently stabilized by the presence of OCR, a well known, effective stabilizer of BMDBM and also in part by BP-3 (Bonda, 2005). One other important feature that can be observed when comparing the spectral profiles of sunscreens A and B, is that despite having the same SPF, they not only have significantly different shapes but they also display different levels of absorbance throughout the UV range, therefore providing different levels of UV protection (sunscreen B > sunscreen A). This discrepancy among sunscreens with same SPFs but with different UV spectral profiles was also found in the 15 commercial sunscreens recently tested by Hojerova et al. (2011) and by Lejeune et al. who tested two SPF 15 sunscreens on a reconstructed skin model (Lejeune et al., 2008).