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1.  Overview     2. History of use     3. Making the pigment     4. Technical details

About the chemical structure:          Chemical name: Cobalt(II) oxide-aluminum oxide Formula: CoO · Al2O3 Refractive index: n/a

A swatch of Cobalt blue paint:

How can you identify Cobalt blue?          Chemical identification: Cobalt blue has coarse particles, like azurite and ultramarine, genuine but is distinguished microscopically by their non-crystalline appearance. It is chemically insoluble and unchanged, even in strong hydrochloric acid Spectra: Raman spectra (at University College London), (pdf file download; at University of Florence, Italy)   Usage and handling:          Permanence: Excellent n/a   Literature:             Cobaltpigmente (at Pigmentlexikon by Th. Seilnacht) Cobalt und seine Blaufarben, Neue Zürcher Zeitung, 214, 15.9.1993, p. 67

Other blues         (intro) - Azurite - Cerulean Blue - cobalt blue - Egyptian blue - Indigo       Prussian blue - smalt - Ultramarine