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Methyl Orange is a pH indicator used in titrations for acids. It is also used for histological microscopy. Further, it is used as counter stain to crystal violet in staining pollen tubes.
Acid-base indicator: pH 3.2 - 4.4.
Gomez-Solís, C.; Ballesteros, J. C.; Torres-Martínez, L. M.; Juárez-Ramírez, I.; Torres, L. A. D.; Zarazua-Morin, M. E.; Lee, S. W. Rapid synthesis of ZnO nano-corncobs from Nital solution and its application in the photodegradation of methyl orange. J. Photochem. Photobiol., A 2015, 298, 49-54.
Varga, M.; Kopecká, J.; Morávková, Z.; K?ivka, I.; Trchová, M.; Stejskal, J.; Prokeš, J. Effect of oxidant on electronic transport in polypyrrole nanotubes synthesized in the presence of methyl orange. J. Polym. Sci., Part B: Polym. Phys. 2015, 53 (16), 1147-1159.
Hazard Statements: H301
Toxic if swallowed.
Precautionary Statements: P264b-P270-P301+P310-P330-P501c
Wash face, hands and any exposed skin thoroughly after handling Do not eat, drink or smoke when using this product. IF SWALLOWED: Immediately call a POISON CENTER or doctor/physician. Rinse mouth. Dispose of contents/ container to an approved waste disposal plant