A basic dye, C25H25N2I, used as a colour sensitiser (violet red in water, blue in alcohol) in photography and for vital staining of leukocytes. ... (05 Mar 2000) ... 
Type: Term Pronunciation: pin′ă-sī′ă-nol Definitions: 1. A basic dye, used as a color sensitizer (violet red in water, blue in alcohol) in photography and for vital staining of leukocytes.