Rhodamine 6G has been used extensively as a model dye to probe the nature of the SERRS effect. ... The fluorescence-quenching properties of surface enhancement coupled with the additional sensitivity obtained from SERRS have been exploited by several researchers.
Rhodamine 6G (R6G) or Rhodamine 590 is a cationic dye with a strong absorption in the visible and a high fluorescence yield. R6G is commonly used as a tracer dye in water to determine the rate and direction of flow and transport. Some examples of Rhodamine dye applications are fluorescence microscopy, flow cytometry, fluorescence correlation spectroscopy, etc.