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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 .
Gefahrenhinweise (EU): H315-H319-H335
Causes skin irritation. Causes serious eye irritation. May cause respiratory irritation.
Avoid breathing dust/fume/gas/mist/vapours/spray. Wear protective gloves and eye/face protection. IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. IF INHALED: Remove to fresh air and keep at rest in a position comfortable for breathing. Store locked up. Dispose of contents/container in accordance with local/regional/national/international regulations.