[N+]([O-])([O-])=O.[Fe+2:5].[N+]([O-])([O-])=O.[C:10]([CH:13]([CH:15]([C:17]([O-:19])=[O:18])[OH:16])[OH:14])([O-:12])=[O:11].[Na+:20].[Na+].[OH-].[Na+].C(O)C>O>[C:10]([CH:13]([CH:15]([C:17]([O-:19])=[O:18])[OH:16])[OH:14])([O-:12])=[O:11].[Na+:20].[Fe+2:5]After iron nitrate, sodium tartrate and sodium hydroxide are mixed in water, ethanol is added. The ethanol-insoluble fraction is separated and dried under reduced pressure to provide iron sodium tartrate. To this iron sodium tartrate are added NaOH and sodium tartrate to provide a solution of predetermined concentration. The preferred concentration of iron sodium tartrate is 200-500 g/l, that of sodium tartrate is 20-70 g/l, and that of NaOH is 10-100 g/l.
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