There are provided a method of detecting an ink residual quantity and a printing device which do not make an erroneous determination as to detection on presenceabsence of ink without influence of ink mist generated in the middle of using a printing device on calibration of an optical sensor. The tool is placed into and withdrawn from the holder by a natural swinging motion with the user maintaining his normal grip on the handle. Bulk porous material objects are created containing open spaces within the microstructure.