The present invention provides a hydrogen peroxide indicator and a peracetic acid indicator that include a substrate on which is disposed an indicator composition that includes at least one of a select group of colorants and a transition metal salt. When it is judged that recovery processing is necessary due to exchange of a head or an ink tank, this information is stored in a RAM and an EEPROM. The specific pattern is deleted from the wiring layer for the specifying rework cell. The oxidation reaction may usually be carried out in the absence of a reaction solvent. The coating has a higher wear andor corrosion resistance than that of the magnesium alloy component. In the internal vessel, a plurality of planar cells is disposed vertically with a gap between the cells, a mixed gas of a fuel and air is descended from top down through the gap having a predetermined width between the cells, and, at a bottom portion of the housing space, the mixed gas is burned to generate electricity.