image is obtained at a weight ratio of 0 2 which is where uniform clear printing images are achieved without the addition of an ester compound that is with the ink material containing only urethane compound as the low temperature melting compound the optical density is substantially lower for a weight ratio higher than 0 5 and lower than 0 1 a ghost image phenomenon arises a low temperature melting compound therefore having a weight ratio of ester compound to urethane compound ranging from 0 1 to 0 5 is preferable the decrease in the optical density od at a weight ratio over 0 3 is due to low mutual solubility between the coloring agent and the ester compound as described above the structure of the solid ink sheet of a second embodiment is the same as that of the first embodiment as an additive material to the low temperature melting compound a fatty acid amide compound is used instead of the ester compound of the first embodiment the blending composition of the material of the ink composition layer 23 in the second embodiment is as follows ______________________________________coloring agent kayaset black product of nippon kayaku ltd 1 part by weight low temperature melting compounds urethane compound 2 parts by weight fatty acid amide product of nippon yushi ltd compound 0 1 to 1 part by weight paraffin compound product of nippon seiro ltd 1 part by weight filler carbon black product of tokai carbon ltd 0 8 parts by weight andsolvent acetone ______________________________________ forming the solid ink sheet as a ribbon sheet the repeated printing test of a solid ink sheet of the second embodiment is.