Ninhydrin is most commonly used to detect fingerprints, as the terminal amines of lysine residues in peptides and proteins sloughed off in fingerprints react with ninhydrin. It is a white solid which is soluble in ethanol and acetone at room temperature.
The marker for a positive ninhydrin test is a deep blue colouration obtained in the solution. This reaction indicates the presence of amino acids, other amines and ammonia in the test sample.
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