addenda in the coordination sphere is indicated by the absorption peak at 620 mg in the spectral absorptancy curves for both the thiocyanate and selenocyanate mixed solvent solutions. Other addenda such as thiosulfate and cyanate also give blue colors with cobaltous ions in mixed solvents. Finally, a wide variety of mixed solvents can be used to develop the blue color, tending to give credence to the dehydration theory.
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