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Identifying human races in terms of skin colour, at least as one among several physiological characteristics, has been common since antiquity.Such divisions appeared in early modern scholarship, usually dividing humankind into four or five categories, with colour-based labels: red, yellow, black, white, and sometimes brown.
The Yellow Peril (also the Yellow Terror, the Yellow Menace, and the Yellow Specter) is a racist color metaphor that depicts the peoples of East and Southeast Asia [a] as an existential danger to the Western world.
High yellow, occasionally simply yellow (dialect: yaller, yella), is a term used to describe a light-skinned black person . It is also used as a slang for those thought to have "yellow undertones". [1] The term was in common use in the United States at the end of the 19th century and the mid 20th century.
This is an accepted version of this page This is the latest accepted revision, reviewed on 2 March 2025. "Skin pigmentation" redirects here. For animal skin pigmentation, see Biological pigment. Extended Coloured family from South Africa showing some spectrum of human skin coloration Human skin color ranges from the darkest brown to the lightest hues. Differences in skin color among ...
Sienna yellow A sy heterozygotes are a dark yellow, while homozygotes are generally a clearer yellow. [4] White-bellied agouti A W mice have agouti coloration, with hairs that are black at the tips, then yellow, then black again, and white to tan bellies. [4] Agouti A looks like A W but the belly is dark like the back. [4]
These ends create thousands of tiny wounds in the skin, which puts the body's immune system into hyperdrive. Blood cells called macrophages go to the site of the wound and engulf the ink particles ...
One average square inch (6.5 cm 2) of skin holds 650 sweat glands, 20 blood vessels, 60,000 melanocytes, and more than 1,000 nerve endings. [5] [better source needed] The average human skin cell is about 30 μm in diameter, but there are variants. A skin cell usually ranges from 25 to 40 μm 2, depending on a variety of factors.
Alfred Blaschko, a private practice dermatologist from Berlin, first described and drew the patterns of the lines of Blaschko in 1901. He obtained his data by studying over 140 patients with various nevoid and acquired skin diseases and transposed the visible patterns the diseases followed onto dolls and statues, then compiled the patterns onto a composite schematic of the human body.