Caucasian hair is largely straight characterized by a diameter range of 50-90 microns.
Mainly found in Far Eastern countries like Japan, China and Korea and Asian countries like India it is up to 120 microns in diameter and its cross section reveals it to be round in shape.
African (Sub Saharan) Hair is considerably flattened, often grooved and frequently vary in diameter along a single strand. It tends to be highly twisted, is sharply kinked at the edges and vulnerable to damage.
STUDY PROVES THAT INDIAN OILED HAIR IS THE BEST IN THE WORLD
Colloquially hair is classified as straight, wavy or curly depending on protein composition and other chemical bonds present in the hair.
Alternatively hair is also classified as normal, dry & oily depending on the level of sebum present. The essential reason for oil build up in hair is the disproportionately high production of sebum from the glands. Perspiration from the head can also create greasy-looking strands, particularly in fine hair.
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