Xanthoproteic test: a reaction due to the prescence of phenyl group (-C6H5) in the protein molecules. it involves the hnitration of the phenyl rings presnt in the aromatic amino acids such as tyrosine, phenylalanine, and tryptophan, forming yellow nitro-substitution products that turn orange when alkali is added (salt formation)
Heller's ring test: this is usd clinically to detect the prescence of albumin in urine.
so.... that's basically it... i hope i helped... ^^