Water-based preparation comprises at least one dye comprising triphenylmethane dyes, azo dyes, cyanine dyes and/or natural dyes, where the preparation has a density of 1.01-1.5 g/cm 3>;. An independent claim is included for a kit comprising a syringe with cylinder and cannula, and a water-based preparation, where the ratio of cylinder diameter to the cannula diameter is 10-2 to 1-0.2, preferably 20 to 1-4 to 1.本発明は、ヒトまたは動物の眼球における内境界膜(ILM)および/または網膜上膜(EMR)を選択的に着色する、細胞に無害な水性の生体適合性を有する着色調製剤、ならびに本発明による水性の着色調製剤を収容するキットに関する。