PROBLEM TO BE SOLVED: To provide techniques of inhibiting color change of a halogenated isoquinoline derivative-containing aqueous composition during high temperature storage.SOLUTION: An aqueous composition contains: a compound represented by the general formula (1) in the figure, or a salt thereof, or a solvate of them, where X represents a halogen atom and trometamol.SELECTED DRAWING: NoneCOPYRIGHT: (C)2016,JPO&INPIT【課題】ハロゲン化イソキノリン誘導体含有水性組成物の、高温保存時の変色を抑制する技術の提供。【解決手段】次の一般式(1)[式中、Xはハロゲン原子を示す。]で表される化合物若しくはその塩又はそれらの溶媒和物、及びトロメタモールを含有する、水性組成物。【選択図】なし