66 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS Figure 7. After application of sunscreen preparation I onto the skin, the corneocytes may be coated by a regular and thin layer of acicular metallic oxide crystals (TEM) (scale bar = 100 nm). 'c 7: Figure 8. Cross-section of a natural brown hair. Presence of a microsphere (H•liosides ©) filled with prismatic TiO 2 crystals at the surface of the cuticle (C) after topical application of sunscreen preparation 2. Uranyl acetate and lead citrate staining (TEM) (scale bar = 1 •xm).
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).
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