fatty acid esters oxyethylene oxypropylene block copolymers acetylene glycol and ethylene oxide adducts thereof and substituted derivatives of these compounds of these the naphthalene sulfonate formaldehyde condensation products and derivatives particularly alkylated products of the condensates and acetylene glycol and ethylene oxide adducts thereof are particularly preferred examples of resinous dispersants include block copolymers random copolymers and graft copolymers composed of at least two monomers at least one monomer being hydrophilic selected from the group consisting of styrene and derivatives thereof vinylnaphthalene and derivatives thereof aliphatic alcohol esters of u03b1 u03b2 unsaturated carboxylic acids meth acrylic acid and derivatives thereof maleic acid and derivatives thereof itaconic acid and derivatives thereof fumaric acid and derivatives thereof vinyl acetate and derivatives thereof vinyl alcohol and derivatives thereof vinyl pyrrolidone and derivatives thereof and acrylamide and derivatives thereof and salts of these copolymers these resins are preferably alkali soluble resins which dissolve in an aqueous solution of a base of these water soluble polymers having a carboxyl group or a salt thereof on their side chains are particularly preferred phytic acid or the salt thereof examples of the salt include salts with sodium potassium lithium ammonium triethanolamine and the like by which the present invention is characterized has a very strong affinity for water therefore the ink according to the present invention preferably contains water as a component water is contented in a proportion ranging from 20 to 95 by weight preferably from 40 to 95 by weight more preferably from 60 to 95 by weight based on the total weight of the ink as a liquid medium a water soluble organic solvent may be used in combination with water to exhibit the effect of the present invention to a more marked extent.