PHYSICAL SUNSCREENS 67 Co!' Figure 9. TEM micrograph without any staining showing a thin and regular coating of a hair fiber with prismatic titanium dioxide (C = cuticle, Cor = cortex) (scale bar = I •tm) Figure 10. Ultrathin section of a skin surface biopsy after application of sunscreen preparation 2. The stratum corneum appears covered with a homogeneous layer of prismatic TiO2 (TEM) (scale bar = 100 nm).

68 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS Figure 11. At higher magnification (TEM), the platelet-like TiO 2 crystals of sunscreen preparation 2 seem unagglomerated (circles), even after application to the skin (Co = corneocyte) (scale bar = 100 nm). Figure 12. In sunblock preparation 3, the mineral ingredient appears widespread in the sun care product (TEM) (scale bar = 100 nm).

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