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During a survival exercice we were told that if you don't drink enough (water) your pee will turn dark yellow. As long as it's transparent or light yellow there's no problem of deshydratation.
And yes, your pee turns blue when you "drink" methylene blue. Over here in Belgium it's common during the first weeks of a school year to see others pee having a blue dye, because at most universities they have the tradition that "les sales bleus" (the filthy blues, first-year students) have to drink methylene blue...
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Complex simplex
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