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Benzopurpurine 4B is a biological stain and pH indicator for pH 2.3-4.4.
Nawal Drici Setti.; Noureddine Jouini.; Zoubir Derriche. Sorption study of an anionic dye - benzopurpurine 4B - on calcined and uncalcined Mg-Al layered double hydroxides. Journal of Physics and Chemistry of Solids. 2010, 71 (4), 556-559.
Minoru Sekido.; Zenzo Morita. Studies on Mixture Dyeing. I. The Kinetics of the Mixture of Benzopurpurine 4B and Sky Blue 6B. Bulletin of the Chemical Society of Japan. 1962, 35(8), 1375-1379 .