| abstract |
Since an ink (2) contains a hydrophobic colloid which will be charged with anpositive zeta potential when the pH of the ink (2) is within a range of over 4 and undern6, it is possible to limit silicon or silicon compound from being eluted into the ink (2)nfrom a circuit board (44) formed from a silicon wafer or the like. Thus, it is possiblento prevent the silicon or silicon compound, if eluted into the ink (2), from beingndeposited on a resistance heater (48) and causing "cogation", or to prevent the siliconnor silicon compound from being deposited in an ink channel (42) and nozzle (45a) tonclog the nozzle. Therefore, the ink (2) will not cause any non-spraying of the ink. |