Memory corruption can be suppressed. A coagulation treatment apparatus for a fluid according to the present invention includes a production device for introducing ions of metal belonging to Group 8 of the periodic table into a fluid containing objects of removal and for producing a coagulated substance in which the objects of removal and the metal ions are bonded to each other. A central knife blade is slidably disposable in the longitudinal extending elongate slot of the cartridge assembly and the anvil assembly, and a knife blade is supported in a distal end portion of at least one of the cartridge assembly and the anvil assembly. The top contoured surface defines open sections in the side surfaces of the mold adjacent to at least one deep-draw section to allow free formation of parts within said at least one deep-draw section. An interference fringe is formed on a subject to be marked using a laser beam to make a marking.