A method for increasing the counterfeit protection for an article with a latent safety feature comprising the following steps: a) providing a substrate with at least one absorbent surface with first and second region b) printing the first region of the at least one absorbent surface with ink by applying ink drops according to a first print pattern c) printing the second region according to a second print pattern d) if necessary, treating the regions which are printed according to the steps b) and/or c) or which are not changed in such a manner that following the treatment the first region does not visually differ from the second region so that the safety feature is not apparent to the eye characterized in that e) ink drops of the ink are present on the absorbent substrate preferably spaced from one another and first and second print pattern differ from one another in such a manner that when applying a liquid to the first and second region without a chemical reaction taking place, the first region visually differs from the second region so that the safety feature is apparent to the eye and with increasing evaporation of the liquid the visual differences become increasingly smaller until the two regions no longer visually differ from one another so that the latent safety feature again becomes invisible, wherein the first and the second print pattern are printed according to different screen densities and/or ink drop sizes in such a manner that at a transition from the first to the second region the screen density and/or the ink drop size increases or decreases continuously and/or in steps or abruptly, wherein the quotient between largest and smallest ink drop size in the first and second region exceeds a screen density limit value and/or ink drop size limit value, wherein the screen density limit value is based on the difference between greatest and smallest screen density and ink drop size limit value to the difference between largest and smallest ink drop size. a) providing a substrate with at least one absorbent surface with first and second region b) printing the first region of the at least one absorbent surface with ink by applying ink drops according to a first print pattern c) printing the second region according to a second print pattern d) if necessary, treating the regions which are printed according to the steps b) and/or c) or which are not changed in such a manner that following the treatment the first region does not visually differ from the second region so that the safety feature is not apparent to the eye characterized in that e) ink drops of the ink are present on the absorbent substrate preferably spaced from one another and first and second print pattern differ from one another in such a manner that when applying a liquid to the first and second region without a chemical reaction taking place, the first region visually differs from the second region so that the safety feature is apparent to the eye and with increasing evaporation of the liquid the visual differences become increasingly smaller until the two regions no longer visually differ from one another so that the latent safety feature again becomes invisible, wherein the first and the second print pattern are printed according to different screen densities and/or ink drop sizes in such a manner that at a transition from the first to the second region the screen density and/or the ink drop size increases or decreases continuously and/or in steps or abruptly, wherein the quotient between largest and smallest ink drop size in the first and second region exceeds a screen density limit value and/or ink drop size limit value, wherein the screen density limit value is based on the difference between greatest and smallest screen density and ink drop size limit value to the difference between largest and smallest ink drop size.