PENETRATION INTO HAIR FIBER 273 Figure 7. Hair fiber pretreated with NaCI (2 rain), dried, and then immersed in silver nitrate (2 rain) followed by exposure to light. Cascade-like silver deposits (4-,,•) adjacent to the outer beta layer of the cuticle cell membrane complex are associated with distinct silver grains within the crnc. Scale bar = 0.5 !•m. throughout the a-layer and exocuticle. Deposits of larger particle sizes were also evident in the endocuticle. In the cortex the inter-macrofibrillar material was well marked by the presence of silver granule deposits (Figure 10). In low-power micrographs this component could be traced throughout the cortex by the pres-

274 JOURNAL OF COSMETIC SCIENCE Figure 8. Hair fiber pretreated with NaCI (30 min), dried, and then immersed in silver nitrate (30 min) followed by exposure to light. Cascades of silver deposits (.•,-•) are seen in all cuticle cells. Extensive silver grains are present in the cuticle cmc's (•). Extended treatment times show silver grains within the endocuticle (•mm). Scale bar = 0.5 }•m. ence of silver. The fine structure of the microfibril/matrix composite was easily defined. Granules of silver were present on pigment granules. The amount of silver deposited in the fiber as a whole increased towards the tip.

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