why does Balck hair turns white?
82701
There are special cells called melanocytes at the base of each hair shaft.  These cells produce a pigment called melanin that gives hair its color.\n\nAs we age, the melanocytes in the hair slow down and then stop producing pigment.  Lacking pigment, the hair shaft is clear, which appears white when in a headful of hair.
516694
same as everyone else who gets dandruff. I can understand why you would be confused though. Dandruff is the flaking of the scalp and if the scalp is black wouldn't the flakes be too, right? Well, all skin, no matter what color, is white when if flakes off because it is dead skin. It's just like when you scratch your arm and the area looks white at first. It's the same with black people.
59916
Because you're a lucky rockstar. Either you were adopted and they didn't tell you, it's a dormant gene, or there's something in your diet or environment that brings out natural red tones in your hair. Don't worry about it, I'll bet it's gorgeous!
454995
When sweat dries it leaves behind salts.  That's what was white.
570527
probably partly because white reflects heat\n\nthey probably also help keep sand and dust in the air out
469294
Hair is an interesting biological structure. What we usually think of as 'hair' is really just the part we see... that's the hair shaft, which contains pigment (a chemical that gives color to things). There is also a hair follicle, which is a multi-cellular structure inside the skin of our scalp that creates the hair strand (making it grow), and also is responsible for the pigmentation. Some of the cells in the follicle make the chemical melanin, which is a skin and hair pigment in many species on our planet. \n\nHair turns grey when the pigment cells in the hair follicle stop making melanin. When this happens due to aging, it's mostly under the control of the genes we inherit. Long periods of constant stress may also contribute, but a big shock won't turn hair grey overnight.
466022
It's got to be pressure.\n\nPolar bears are white because the pressure at the poles is low, so they have to be able to absorb heat.\n\nPressure makes you cry if it's too much.\n\nPressure in your bladder makes you have to pee.\n\nPeer pressure makes girls comb their hair...Otherwise we wouldn't bother!\n\nCelebrities usually crack under pressure.\n\nMany normal people will shine under pressure.\n\nPancakes turn brown thanks to pressure generated by the heat.\n\nChampagne will bubble until the pressure of the carbonation has disappeared.\n\nIf you squeeze something under pressure, BAM, there it goes.\n\nIf you are "looking" at pressure, you're in it, like in an airplane, and your ears pop.
996431
No the actual hair doesn't grow back any faster or thicker.  But shaving can stimulate other hair follicles to grow darker.  The reason for colored hair is due to melanin produced at the site of the hair follicle which is then used in the production of the hair shaft.  This melanin isn't used in all hair, which is why some to a lot of hair looks white, blonde, or even clear on the body.  When the melaninocyte (the cells that produce melanin) are stimulated by UV rays (from sunlight), hormones (during puberty or genetic), or some other source, they begin producing different colored hairs, depending on what those cells are designed for (i.e. red, blonde, black, brown, etc).  When you have more hair follicles producing colored hair, it just appears that the hair has grown faster of thicker.
891275
When I see a white person with dread all I think is why do they have it. Dreads don't look good on white people.  The texture of white people hair is different from a black person and it don't even look like dreads. Its look like a hot mess. Its not offensive its just look bad, horrible, and hot mess. \n\nOh we don't call its dreadheads it dreadlocks lmao.
278274
Previous answer was close.  The hair follicle does not die, just the pigment cells that produce melanin, the chemical that gives hair it's color. As the hair has fewer cells producing melanin, the color becomes less pronounced, until it turns gray.
470590
Stress can turn a person's hair gray faster than if they had less stress.  Also, after a particularly traumatic event, a person can have a patch of hair turn completely white.  This has been reported after plane crashes, etc.
50071
The whiteness of clouds is due to the tiny particles of water that make them up refracting the sunlight that enters them to make it appear brighter as it comes out. They are white because all wavelengths are allowed to pass through them; none are absorbed.\n\nThe fluffiness of some clouds is caused by the interactions of winds and pressures that force the water particles into a particular shape.
293883
People don't acknowledge real blond hair, especially on men.  I'm naturally blond, and when I look at my natural hair color, it looks blond to me.  But no one calls it blond unless I bleach it platinum.  Women are just far more likely to bleach their hair, and the more accostomed you become with thinking bleach-blond is normal, the less normal blond hair strikes you as being blond, unless the person is naturally extremely fair-haired.\n\nThere's one more thing: the longer your hair is, th more noticable the "blondness" is.  This is for a couple of reasons.  One is that langer hair has more time to be exposed to the sun and get naturally bleached, and the other is that hair seen at an angle looks darker.  Since women's long hair runs straight down, it is more blond-looking than short hair.
411151
the reaction produces NaCl, which is white
76789
Likely happens due to static electricity grabing the hair.  All the rubbing on the front likely creates the force and the weak her likely slips off.
669120
may be bleaching is the answer
363902
there is no other answer, your only option is dye.  once your hair loses its color you can't bring it back, your temporary fix is dye, which you will have to do forever.  many men look sexy with salt and pepper hair.  if you do leave it white, make sure you use a certain shampoo you can buy in "Sally's" for graying hair, cuz if you don't it will start looking yellowish and nasty in color.  good luck