A spittoon system is provided for avoiding formation of an ink stalagmite during spitting of a pigment-based ink from a first printhead of an inkjet printing mechanism. First, ink is spit from a second inkjet printhead containing a dye-based ink formulation and accumulated in a pool defined by spittoon...http://www.google.com.tw/patents/US6644778?utm_source=gb-gplus-share專利 US6644778 - Stalagmite dissolving spittoon system for inkjet printheads
