The yellow coloring is urochrome which is a chemical produced when your liver processes dead blood cells. It gets darker through a combination of hydration, which dilutes this urochrome, and a mixture of foods and medications that can discolor urine. Your pee is clear when drunk because alcohol slows down the production of ADH in your body which regulates urination. You then produce more urine and pee more. Because your liver can only produce urochrome at a certain speed you end up with clear urine due to low levels of urochrome and high levels of urine.
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