Dating a hair stylist
Bulb of hair layers consist of fibrous connective tissue, glassy membrane, external root sheath, internal root sheath composed of epithelium stratum (Henle's layer) and granular stratum (Huxley's layer), cuticle, cortex and medulla of hair.
Hair follows a specific growth cycle with three distinct and concurrent phases: anagen, catagen, and telogen phases; all three occur simultaneously - while one strand of hair may be in the anagen phase, another may be in the telogen phase.
Blond hair is the result of having little pigmentation in the hair strand.
Gray hair occurs when melanin production decreases or stops, while poliosis is hair (and often the skin to which the hair is attached), typically in spots, that never possessed melanin at all in the first place, or ceased for natural genetic reasons, generally, in the first years of life.
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Hair is a protein filament that grows from follicles found in the dermis.
The shape of the follicle determines the shape of the cortex, and the shape of the fiber is related to how straight or curly the hair is. Oval and other shaped fibers are generally more wavy or curly. Its complex structure slides as the hair swells and is covered with a single molecular layer of lipid that makes the hair repel water.