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Background
Natures and amounts of water retained at the surface of stratum corneum (SC) of human skins, affecting skin health and penetration of chemical components, remain unclear.
Methods
A keratin film, a main component of human SC surface, was measured by IR micro‐spectroscopy combined with a quartz crystal microbalance (QCM) and a relative humidity (RH) control system.
Results
Water contents...
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