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The Andre Walker Hair Typing System, also known as The Hair Chart, is a classification system for hair types created in the 1990s by Oprah Winfrey's stylist Andre Walker. [ 1 ] [ 2 ] [ 3 ] It was originally created to market Walker's line of hair care products but has since been widely adopted as a hair type classification system .
This measurement is not precise because human hair varies in diameter, ranging anywhere from 17 μm to 181 μm [millionths of a metre] [8] One nominal value often chosen is 75 micrometres (0.0030 in), [5] but this – like other measures based upon such highly variable natural objects, including the barleycorn [9] – is subject to a fair degree of imprecision.
While many variations of the style exist, the one common feature is that all of the hair on the sides and back of the head is clipped very close, usually 1 ⁄ 16 inch (1.6 mm) or shorter, up to a point above the temples (referring to the "high" part of its name). A sharp line delineates the boundary between the close-cut sides and back and the ...
By default, the output value is rounded to adjust its precision to match that of the input. An input such as 1234 is interpreted as 1234 ± 0.5, while 1200 is interpreted as 1200 ± 50, and the output value is displayed accordingly, taking into account the scale factor used in the conversion.
Rotary clippers have blades that readily snap on and off. Blades are available that leave from 1 ⁄ 250 inch (0.10 mm) to 3 ⁄ 4 inch (19 mm) of hair on the scalp when the clipper is guided over the head with the teeth of the clipper blade in contact with the scalp. Blades are numbered differently than guards.
Scalp hair was reported to grow between 0.6 cm and 3.36 cm per month. The growth rate of scalp hair somewhat depends on age (hair tends to grow more slowly with age), sex, and ethnicity. [3] Thicker hair (>60 μm) grows generally faster (11.4 mm per month) than thinner (20–30 μm) hair (7.6 mm per month). [4]
The average rate on a 30-year mortgage in the U.S. eased this week, though it remains near 7% after mostly rising in recent weeks. The rate slipped to 6.81% from 6.84% last week, mortgage buyer ...
Stage I begins with thinning on the top of the head. In stage II the scalp starts to show. All of the hair at the crown of the head may be lost when the hair loss progresses to stage III. However, the scale is used merely for general categorization. Many women do not actually fit into the Ludwig stages.