The invention concerns a sintered refractory product having the following average chemical composition, in weight percentages based on oxides: 20%<Al2O3<90%; 6%=SiO2<30%; 3%<ZrO2<50%; 0%=Cr2O3<50%. A user draws a character using a drawing apparatus. The invention also relates to food products which contain the milk according to the invention or part of it.