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Why is cheese yellow or orange when milk is white?

The British Cheese Board recently launched a competition inviting songwriters to compose an anthem celebrating cheddar, Britain?s most popular cheese. Of the five entries shortlisted for the finals, four pay tribute to the cheese?s notable hue. (Sample lyric: “Every pickled onion/ dreams of lying beside/ a wedge of golden cheddar, /crusty bread on the side.”) But why is cheddar yellow or orange when milk is white?