the addition of an organophosphato - titanate and an organophosphato - zirconate to printing ink improves the adhesivity of the ink to a variety of substrates . a concentrate of the two organo - metallic components may be added to a conventional ink or added to the ink formulation during the ink &# 39 ; s initial preparation . in addition to improving adhesivity , the additives reduce drying time , permit more rapid processing , and minimize the need for solvent diluents .