Ruhemann purple

Ruhe·mann pur·ple

(rū'mahn pŭr'pĕl)
A blue-violet dye formed in the reaction of ninhydrin with amino acids.
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References in periodicals archive ?
The analyte and aqueous ninhydrin solution upon heating for 2-5 min produced the Ruhemann purple colored drug-derivative which was detected at two wavelengths, 400 nm and 567 nm.
The tube was heated until the development of Ruhemann purple color.
Various variables, heating time for effective derivatization, heating type (direct on flame and water bath), drug-reagent ratio, reagent composition and storage temperature for the derivatized drug, involving in the development of Ruhemann purple color were optimized.