The hair shaft, or hair fiber, comprises 3 layers: thecuticle, the cortex, and the medulla.Chemically, theshaft consists of proteins, lipids, water, melanin, and traceelements.A hair shaft can tell us about a person’s haircare history,and may feature signs of weathering, fromthe root to the tip.The tip of the hair shaft, as the oldestpart, exhibits the most cosmetic damage, whereas the root is probably less porous and has different chemical propertiesthat affect its response and influence the cosmetic effects of treatments applied to this region.
The hair shaft is a flexible structure that can be stretched to a considerable degree by applying traction. Breakage is thought to occur at loads ranging between 50 g and 100 g.This is relevant to prosthetic cosmetic practices, such as the application of hair extensions or of hair integration systems
The hair shaft, or hair fiber, comprises 3 layers: thecuticle, the cortex, and the medulla.Chemically, theshaft consists of proteins, lipids, water, melanin, and traceelements.A hair shaft can tell us about a person’s haircare history,and may feature signs of weathering, fromthe root to the tip.The tip of the hair shaft, as the oldestpart, exhibits the most cosmetic damage, whereas the root is probably less porous and has different chemical propertiesthat affect its response and influence the cosmetic effects of treatments applied to this region.
The hair shaft is a flexible structure that can be stretched to a considerable degree by applying traction. Breakage is thought to occur at loads ranging between 50 g and 100 g.This is relevant to prosthetic cosmetic practices, such as the application of hair extensions or of hair integration systems
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