This is an odd request, I know, but I've seen questions answered here before that really surprised me, so here goes.
I need to determine with a good level of certainty whether a substance is/is not urine, but I do not have access to the proper equipment and testing materials. It looks and smells like urine, but that isn't precise enough for my purposes. So, without access to spectroscopy equipment, how do I go about determining if what I'm seeing is in fact urine?
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