title: The azure dyes: their purification and physicochemical properties. I. Purification of azure A.
mesh_terms: D000042:Absorption; D000468:Alkalies; D055598:Chemical Phenomena; D002621:Chemistry; D002845:Chromatography; D005782:Gels; D007097:Imines; D008751:Methylene Blue; D010640:Phenothiazines; D012822:Silicon Dioxide; D012995:Solubility; D012997:Solvents
chemical_list: D000468:Alkalies; D005782:Gels; D007097:Imines; D010640:Phenothiazines; D012997:Solvents; D012822:Silicon Dioxide; D008751:Methylene Blue