Lots of casein, which is a white salt of calcium.
Source(s):
http://www.coolquiz.com/trivia/explain/docs/milk.asp
http://en.wikipedia.org/wiki/K-Casein

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both are right! : )
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Real milk isn't white. It's sort of a creamy very pale yellow because of the vitamins and other nutrients. A lot of that is destroyed in processing, so they add back in powdered milk to give it body. It also has the effect of making it whiter.

This is a very good video, but I can't post it because they disabled embedding. It's very good:

http://uk.youtube.com/watch?v=Yr5pl6lgjJ8
Source(s):
http://www.westonaprice.org/modernfood/dirty-secrets.html

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Well it is my understanding that milk is mostly white due to the fact that it contains copious amounts of Calcium Phosphate. From a physical optics point of view the reason is ,"That the whiteness is due to the scattering of light by the colloidal particles of the milk emulsion. Just the fact that we get white shows that there is no absorption, so whatever is there is transparent i.e the casein which contains the Calcium Carbonate.
Another notable factor is the fact that ,nearly all whites are the result of scattering from colloidal-sized particles,they you have it that is why we perceive the color of milk as white akin to a surface that reflects back all the light shone on it much like the white pigment titanium dioxide which is made of clear crystals, dispersed as colloidal particles.Now there you have it,I hope that was a helpful answer.
Source(s):
http://mysite.du.edu/~jcalvert/phys/milk.htm.
http://www.answerbag.com/q_view/747128
http://en.wikipedia.org/wiki/Milk

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Those chalky-white mustaches that color our lips after chugging down a refreshing ice-cold glass of creamy milk is caused by the protein called Casein.

Rich in calcium, Casein helps contribute to milk's white color.

In addition, the cream that is found in milk contains white colored fat. The more cream in milk the more white it is.

Low and non-fat milk appear more grayish rather than white because they contain less cream.

Another reason milk looks white to our naked eyes is because some objects do not absorb very much light. Rather than absorb light, these objects reflect light. For instance, red colored objects reflect only red light and absorb the other colors of light in the rainbow spectrum. The molecules that make up Casein and cream reflect light. That's why milk is white.
Source(s):
http://www.coolquiz.com/trivia/explain/docs/milk.asp

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