between the sub layer 4 and the decoration 31 the compositions of the decoration 31 and finishing layers as well as the heat stable binder of these layers if need be are such as described beforehand on fig8 is represented a cross sectional schematic view of an industrial device for ink jet decorating operating according to the u201c drop on demand u201d technology u201c dod u201d the operating of this device is that described in international patent wo 2006 126189 it consists in a piezoelectric dod type method for which the drops required for printing are created by the deformation of the wall of the ink container as a result of an electrical excitation of a piezoelectric crystal in these examples except otherwise indicated all percentages and portions are expressed in weight as printing device a printer commercialized by kerajet is used for example using a printer of commercial reference 700 u00d7 usually intended for the printing of ceramic squares aluminum disks with a diameter of 31 cm and a thickness of 2 4 mm inks for ink jet printing on heat stable coating of ceramic type enamel or sol gel blue colored inks commercialized by company ferro corporation under trade names quickpaint inks or keraminks orange colored inks commercialized by company ferro under trade names quickpaint inks or keraminks brown colored inks commercialized by company ferro under trade names quickpaint inks or keraminks yellow colored inks commercialized by company ferro under trade names quickpaint inks or keraminks pink colored inks commercialized by company ferro under trade names quickpaint inks or keraminks black colored inks commercialized by company ferro under trade names quickpaint inks or keraminks pigmented aqueous inks for ink jet printing on non enameled.