[S:1](=[O:5])(=[O:4])([OH:3])[OH:2].[S:6]([O-:10])([OH:9])(=[O:8])=[O:7].[Na+].[OH-].[Cr+3:13].[OH-].[OH-]>>[S:1]([O-:5])([O-:4])(=[O:3])=[O:2].[Cr+3:13].[S:6]([O-:10])([O-:9])(=[O:8])=[O:7].[S:1]([O-:5])([O-:4])(=[O:3])=[O:2].[Cr+3:13]A process, as claimed in claim 4, wherein sulfuric acid or sodium hydrogen sulfate is added to the chromium hydroxide obtained, to form chromium sulfate.
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