opaque ink compositions suitable for ink jet printing on metal , plastic , or paper surfaces , the ink characterized by opaque properties in light , incorporating , in solution , at least one cellulosic derivative , a resin component , and at least one solvent , proportioned to give the ink property of opacity . according to another of its aspects , this invention is a process for information recording comprising producing a fine jet of liquid , directing said jet of liquid onto a recording medium , modulating the density of said applied jet by an electric field in accordance with the information to be recorded , thereby recording said information , and thereafter applying moisture to said recording medium bearing said recorded , thereby rendering said recording opaque .