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 .