an area that is indicated by the dashed box 120 fig8 shows the magenta extraction image of the non print side of the paper in fig7 it is evident that the image content from the print side of the paper appears in mirror image on the non print side in the area 120 that is subject to the infrared heating process whereas outside of this area no image appears this shows that the infrared heating leads to migration of the magenta component of the ink the result of this two pass printing process is therefore similar to the case shown in fig6 wherein a one pass printing process of a combined black and magenta ink was used printing a porous substrate such as the office paper in this example with two different inks will likely lead to a mixture of the two colorants on the printed substrate in fact reversing the order of printing had no effect on the non print side image after the heating step however for other inks and substrates it may be conceivable that the sequence of printing could lead to different efficacy of migration in particular if a multilayer structure is created on the print side of the substrate consisting of the individual inks one can then chose the sequence of printing that creates the optimal effect upon heat treatment fig9 a shows a halftone image of the print side of a sheet of glatfelter multi purpose office paper material no 22761 that was printed with a dod inkjet printer in alternating fashion using.