title: Application of picric acid to the extraction-colorimetric determination of phenothiazine derivatives.
mesh_terms: D003124:Colorimetry; D010640:Phenothiazines / Q000032:analysis*; D010851:Picrates; D013055:Spectrophotometry, Infrared; D013056:Spectrophotometry, Ultraviolet
chemical_list: D010640:Phenothiazines; D010851:Picrates