saf·ra·nin 
(săfrə-nĭn) also saf·ra·nine (-nēn′, -nĭn)
(săfrə-nĭn) also saf·ra·nine (-nēn′, -nĭn)n.
Any of a family of dyes based on phenazine, used chiefly as biological stains.
[French safran, saffron (from Old French; see SAFFRON) + -IN.]