A pigment ink is provided which is used in an ink jet recording apparatus in which ejection orifices for a pigment ink and ejection orifices for at least one type of reactive ink that destabilizes a dispersed state of pigment in the pigment ink are capped with the identical cap provided with a unit for removing an ink in the cap, achieving compatibility between bleeding resistance and reliability. The cache memory temporarily stores a priority flag in each cache entry, and the priority flag indicates whether data is to be used during execution in the exclusive control section. The motorized tensioning device includes a torque transmitting system that allows for incremental tightening, incremental loosening, and full loosening of the tensioning member. The toothbrush heads include a support member and a plurality of bristles or tufts of bristles extending from the support member, the bristles or bristle tufts having different lengths.