0 Members and 1 Guest are viewing this topic.
Another source of tannin is tea and coffee in our diet, concentrated in the skin by evaporation from the sun and the wind. This tannin in the skin can be observed when sweating in bed as the tannin is excreted in the sweat staining the sheets and mattress. I suspect that additional oxidization of the fluids at the surface of the skin may play a part also.How else can the colour of a new born babies skin be explained when in the case of a native African baby for example has never been in contact with the sun, yet shows evidence of darkened skin tone. Food for thought?
Are people with darker skin colours more resistent to having skin cancer?
I heard that melanin is what causes are skin to tan.. But there is no way of taking melanin out, for people who want their skins to whiten?Like a cream or lotion which removes melanin or such.
Oh.. But if their skins are darker.. Don't they absorb more sunlight, thus more vitamin D?
Quote from: Seany on 03/09/2007 13:28:21I heard that melanin is what causes are skin to tan.. But there is no way of taking melanin out, for people who want their skins to whiten?Like a cream or lotion which removes melanin or such.I don't think there is a safe way of doing it (although I suspect there may be chemicals you could use to whiten the skin, but I don't think they are safe).The most common ways of whitening the skin have either been to use an external layer of white pigment over the skin, or simply to avoid exposure to the sun (hence the totally enveloping Arab dress).
beta-carotene has nothing to do with melanin either, yet can turn a babies skin bright orange, thus proving that tannin can also migrate to the skin.He takes a bow and anticipates a little back peddling
So how come we whiten when not in the sun anymore?
In that case, what is the colour of a chimp's skin if you shave the fur off?
In considering the tone of human skin in the long span of human evolution, Jablonski and Chaplin note that there is no empirical evidence to suggest that the human ancestors six million years ago had a skin tone different from the skin tone of today's chimpanzees—namely light-skinned under black hair.
The present article reviews various evolutionary events that resulted in skin color variation among humans. Skin of the early man is presumed to be colorless as that of the chimpanzees.
Chimpanzees are covered by a coat of brown or black hair, but their faces are bare except for a short white beard. Skin colour is generally white except for the face, hands, and feet, which are black. The faces of younger animals may be pinkish or whitish. Among older males and females, the forehead often becomes bald and the back becomes gray.
Skin/Color/Coat: The colour of the coat varies considerably, ranging through black, silver and shades of red. Black is more usual. The skin is also black. As a male gorilla reaches physical maturity (between 12 and 15 years of age), he develops his silvery grey colouration. Old males often lack chest hair. The face, ears, palms and soles of feet are bare.