Sulforhodamine B

Sulforhodamine B or Kiton Red (C₂₇H₃₀N₂O₇S₂; Molecular Weight 558.66 grams/mole) is a fluorescent dye with uses spanning from L.I.F.(Laser Induced Fluorescense) to the quantification of cellular proteins of cultured cells. The red, solid, water soluble dye is primarily used as a polar tracer.

The dye absorbs 565nm light and emits 586nm light. It does not exhibit pH dependent absorption or fluorescence over the range of 3 to 10.