Abstract: Disclosed is a particulate mixture having the following chemical composition, in percentages by weight on the basis of the oxides: ZrO2: ?10.0%; 2%<Al2O3?80%; 2 to 20.0% of an oxide chosen from Y2O3, Sc2O3, MgO, CaO, CeO2, and mixtures thereof, the MgO+CaO content being less than 5.0%; 0 to 18.0% of an oxide chosen from ZnO, lanthanide oxides except for CeO2, and mixtures thereof; less than 12.0% of other oxides. The particulate mixture also has a pigment made of a material chosen from oxide(s) of perovskite structure, oxides of spinel structure, oxides of hematite structure E2O3, the element E being selected from the group GE(1) consisting of the mixtures of aluminum and chromium, the mixtures of aluminum and manganese, and mixtures thereof, the oxides of rutile structure FO2.