CAS 3520-42-1 Sulforhodamine B (SRB, CI Acid Red 52) ni irangi ry'umutuku rya cationic oxygenanthraquinone. Ni ifu y'umutuku wijimye ifite ubushobozi bwo gushonga neza mu mazi. Ishobora kwinjizamo 565 nm naho imyuka myinshi ni 586 nm. Ifite ubushobozi bwo gufotora neza. Mu bihe by'aside nkeya, ishobora guhuzwa na aside amine z'ibanze zo mu ngirabuzimafatizo kandi ntishobora kwinjira mu ruhu rw'uturemangingo. Iki kintu gikoreshwa cyane mu buryo bwa SRB mu rwego rw'ubushakashatsi bwa siyansi, mu gusuzuma ikwirakwira ry'uturemangingo mu buryo bwa vitro n'imiti irwanya kanseri. Ishobora kandi gukoreshwa mu gusiga irangi ry'urumuri rw'ibice by'uturemangingo no gukurikirana fluorescence mu gice cy'amazi. Muri icyo gihe, nk'irangi ry'aside, rishobora gukoreshwa mu gusiga irangi mu bwoya, mu hariri, muri nylon n'indi myenda ndetse no mu ruhu no mu mpapuro.