Our company is currently using TamuraDSR2200 ink for printing and we encounter problems of suspected ink residue as well as bubbling .I do not know if anyone have encounter such problems ,but after I change the ink to a fresh bottle , the problem was resolved . I suspect either the ink prepared was kept more than 36hrs and the viscosity changes . According to my understanding , the ink could be use without any quality problem for 48hrs . Please advise .