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1853 E. Fremy in Chem. Gaz. 11 202 The following four series of salts, differing among themselves, are produced, namely—A. Oxycobaltia salts... B. Luteocobaltia salts... C. Fuscocobaltia salts... D. Roseocobaltia salts (sels de roséocobaltiaque), which are formed when ammoniacal solutions of cobalt salts are decomposed by an excess of ammoniacal salt in the presence of the air.

1856 W. Gibbs & F. A. Genth in Smithsonian Contrib. Knowl. (1857) 9 Art. v. 48 The salts of Xanthocobalt may be prepared..from neutral, acid, or ammoniacal solutions of the salts of Roseocobalt or Purpureocobalt.

1859 Chem. Gaz. 17 84 A new ammoniaco-metallic base, which the author calls roseo-chrome.

1880 Jrnl. Amer. Chem. Soc. 2 290 Boiling the aqueous solution changes it partly into the roseochromium chloride.

1883 Jrnl. Chem. Soc. 44 1058 Roseorhodium salts are very readily detected by means of potassium ferrocyanide.

1913 W. A. Noyes Textbk. Chem. xxxiii. 563 There are many complex salts, such as roseorhodium chloride, [Rh(NH₃)₅H₂O]Cl₃.

1922 T. M. Lowry Inorg. Chem. xli. 798 Roseo-cobaltic chloride..is formed by neutralising this base with hydrochloric acid, or by digesting the purpureo-chloride itself with warm dilute ammonia.

1940 G. H. J. Adlam & L. S. Price Higher School Certificate Inorg. Chem. (ed. 2) liv. 573 Those compounds which do not contain the maximum number of ammonia molecules are unstable and in aqueous solution take up water, slowly forming red or ‘roseo’ compounds.

1989 Jrnl. Water Pollution Control Federation 61 1469/1 Several other potential forms of this complex are diammine cobalt(III) chloride (CoCl₂·2NH₃), roseo cobalt chloride ([Co(NH₃)₅HO]Cl₂), and purpureo cobaltic chloride (Co(NH₃)₅Cl]Cl₂).