The invention concerns a removable water-based ink essentially containing: (a) 5-30 % by wt. of one or more mineral or organic pigments, (b) 5-30 % by wt. (as solids) of one or more water-dilutable cationic resins, (c) 0-25 % by wt. of one or more organic solvents, (d) 20-70 % by wt. of water and (e) 0-10 % by wt. of auxiliaries.
