To provide an aqueous ink composition for a latent image which is a latent image with suppressed visibility in a visible light region, capable of visualizing the latent image after irradiation with ultraviolet light, a method for using the same, and a printed matter.The aqueous ink composition for a latent image of the present invention is an aqueous ink composition for a latent image, which has light transmission properties in a visible light region and is used for printing the latent image, the aqueous ink composition comprising at least a fluorescent agent that emits fluorescence in a visible light region by irradiation with ultraviolet light in a wavelength range of 100 nm to 400 nm, wherein the fluorescent agent is at least one selected from the group consisting of riboflavin, riboflavin butyrate, riboflavin sodium phosphate, cinnamic acid derivatives, L-tryptophan, tyrosine, phenylalanine, quinine, quinine hydrochloride dihydrate, quinine sulfate, Red No. 3, Red No. 104, Red No. 105, Red No. 106, fumarate, chlorophyll, and rhodamine, and the content of the fluorescent agent is in a range of 0.001% by mass to 10% by mass based on the total mass of the aqueous ink composition for a latent image.本發明提供一種於可見光區域下為抑制視認性之潛像且於紫外線照射後能夠使該潛像顯影化之潛像用水性墨水組成物、使用方法及印刷物。本發明之潛像用水性墨水組成物係於可見光區域具有透光性且用以印刷潛像者，其中，至少包含藉由照射波長區域為100nm~400nm之範圍之紫外線而於可見光區域發出螢光的螢光劑，上述螢光劑係選自由核黃素、核黃素丁酸酯、核黃素磷酸酯鈉、桂皮酸衍生物、L-色胺酸、酪胺酸、苯丙胺酸、奎寧、奎寧鹽酸鹽二水合物、硫酸奎寧、紅色3號、紅色104號、紅色105號、紅色106號、富馬酸鹽、葉綠素及玫瑰紅所構成群組中之至少1種，上述螢光劑之含量係相對於潛像用水性墨水組成物之總質量為0.001質量%~10質量%之範圍內。
