An ink-jet printing apparatus restricts fluctuation of the printing density due to coagulation and settle out coloring agent employing a water based ink, in which a water insoluble coloring agent or the coloring agent having low water solubility is dispersed. By this, movement of the ink caused due to...http://www.google.fr/patents/US5963236?utm_source=gb-gplus-shareBrevet US5963236 - Ink-jet printing apparatus
