Do You Know Why Milk Is White? Know Here

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Why is milk white?
Answer 1:
Milk is white because of its reflectance properties. The reason anything is white is that it reflects all wavelengths of light and absorbs none, therefore it is white. If milk were black, that would mean it absorbs all wavelengths of light and reflects none. The reason a shirt is blue is that all wavelengths of light are absorbed except for blue, which is reflected.
Light can have other properties as well. For instance, the reason that asphalt on the road gets hot is because it's black and absorbs almost all energy from the sun and reflects almost none. White things, like roofs, tend to reflect wavelengths of light and therefore keep the house cooler.

Answer 2:
All milk is white but the shades of white will vary depending upon the composition or what is dissolved in the milk. The most important factors that contribute to the color of milk are fat, how much cassein there is(one of the classes of milk proteins) and what calcium complexes (these are minerals), and how much water-soluble riboflavin (a vitamin). These compounds contribute to milk's opaque or ivory color by interfering with light transmission.
So why is milk white and not green for example? Because there are so many fat and protein molecules in milk that enough light at all wavelengths gets scattered giving the appearance of white light. If all the wavelength of the light would get absorbed, milk would be black.
The color also depends on what the cow eats. If there is a lot of carotene in the diet it will also affect the color. They provide a yellowish color. High concentrations of riboflavin also contribute to the yellow color. Removal of the fat and therfore carotenoid pigments and solids when making skim milk makes the milk look bluish. 



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