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It is a derivitized resorcinol dye compound with an absorption maximum of 432 nm. Used as a pH indicator.
Rosa Carballo; Alfonso Castiñeiras; Berta Covelo; Juan Niclós; Ezequiel M. Vázquez-López. Synthesis and characterization of a potassium complex of magneson: [K(HL)(OH2)2]? [H2L=4-(4-nitrophenylazo)resorcinol (magneson)]. Polyhedron, 2001, 20 (18), 2415-2420.
Chuan Yang; Yuan Li; Cheng Huang. Determination of cationic surfactants in water samples by their enhanced resonance light scattering with azoviolet. Analytical and Bioanalytical Chemistry, 2002, 374, (5), 868-872.
Reagent for Mg.
Hazard Statements: H315-H319-H335
Causes skin irritation. Causes serious eye irritation. May cause respiratory irritation.
Precautionary Statements: P261-P264b-P271-P280-P302+P352-P304+P340-P305+P351+P338-P312-P332+P313-P337+P313-P362-P501c
Avoid breathing dust/fume/gas/mist/vapours/spray. Wash face, hands and any exposed skin thoroughly after handling Use only outdoors or in a well-ventilated area. Wear protective gloves/protective clothing/eye protection/face protection. IF ON SKIN: Wash with plenty of soap and water. IF INHALED: Remove to fresh air and keep at rest in a position comfortable for breathing. IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. Call a POISON CENTER or doctor/physician if you feel unwell. If skin irritation occurs: Get medical advice/attention. If eye irritation persists: Take off contaminated clothing and wash before reuse. Dispose of contents/ container to an approved waste disposal plant