resin layer an adhesive layer and a colored porous resin layer in a substrate application_number US 201514820925 A description examples of a substrate layer 1 of a sheet a illustrated in fig1 include a paper sheet or a film here on coated paper for example a coat 110 manufactured by nippon paper industries co ltd a release layer 2 for example silicon ks3502 manufactured by shin etsu chemical co ltd a resin layer 3 for example a cover coat resin 300 manufactured by goo chemical co ltd a porous resin layer 4 for example a mixture of fps 2 silica manufactured by shionogi amp co ltd and a transparent urethane resin of ud710 manufactured by dainichiseika color amp chemicals mfg co ltd or the like were provided and respective layers were laminated into a single sheet a although the lamination of the sheet a was transparent by mixing white titanium oxide as a color material into the resin layer 3 or the porous resin layer 4 the printed workpiece was finally covered with white and becomes white irrespective of the color of an ink resin toner other color materials may also be mixed examples of the substrate layer 1 of a sheet b illustrated in fig2 include paper or a film although st600kt manufactured by lintec corporation which is processed up to the release layer 2 may be used here coated paper for example the coat 110 manufactured by nippon paper industries co ltd the release layer 2 for example silicon ks776l manufactured by.