Abstract: A meltable ink which is solid at room temperature and liquid at elevated temperature, used in combination with an inkjet printhead for the image-wise transfer of the ink to a receiving material, wherein the printhead contains a number of ink ducts, each ink duct leading to an opening for jetting ink drops from said duct, which ducts are formed in a duct plate made basically of carbon, whereas the ink can penetrate into the carbon in such manner that if an element made from said carbon is enclosed by the ink for about 20 hours at a temperature of about 130° C. said element has an increase in mass of more than 1.5%.

Abstract: The invention relates to an ink composition which is solid at room temperature and liquid at a higher temperature, comprising a non-aqueous carrier composition and two compatible dyes, one of which is fluorescent and one non-fluorescent, wherein the said dyes are of the same type. In one embodiment, the dyes in the ink are both of the anthraquinone type.