Please directly answer the theoretical background (positive color reactions and what is being detected) of each test GENERAL: BIURET - NINHYDRIN SPECIFIC XANTHOPROTEIC TEST - MILLON'S TEST - HOPKINS-COLE TEST - SAKAGUCHI TEST - LEAD ACETATE TEST - NITROPRUSSIDE TEST - FOLLIN'S REACTION - SULLIVAN'S TEST - PAULY REACTION - LIEBERMAN'S TEST -

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