The main reason for the difference in color is the difference in fat. The color of the butter is slightly yellow. When milk is thickened with fire, it turns slightly yellow. The color is yellow as there is more milk in the milk. The amount of butter in butter is more than milk. The question is where this yellow color comes from. It comes from beef. The grass, husks and wheat that cows eat contain beta carotene. These are yellow in color. This yellow beta carotene is stored in cow's milk fat. But that color is not seen in milk. Because most of the milk is water, which is white in color. Only 3 percent are non. 30 to 40 percent of the milk is not. Butter contains about 80 percent. The milk droplets in the milk are covered with a thin layer. As a result, the beta carotene inside is invisible to the naked eye. The coating around the butter reflects light in such a way that the color of the milk looks white. The yellowing of beta carotene is not seen. Butter made from the milk of sheep, goats or buffalo (water buffalo) is white in color. Because these animals do not store beta carotene, like cows. When you see the yellow color of butter, water comes in the pocket. Because, the taste of whipped butter is incomparable. For that, artificial colors are often added to commercially produced butter to make it look more yellow.