PROBLEM TO BE SOLVED: To provide, among others, direct dyes which not only enable keratin fibers to be dyed satisfactorily but which are also light-stable, capable of resulting in colors that resist the various attacks that the fibers may be subjected to, such as inclement weather, washing and perspiration, and further, which are sufficiently stable in the presence of oxidizing agents such as aqueous hydrogen peroxide solution to be able to deliver simultaneous lightening of the fibers.SOLUTION: The present invention relates to azomethine-type direct dyes having a triaromatic unit represented by formula (I), and also to the use thereof for dyeing keratin fibers, in particular human keratin fibers such as hair. [n1 and n2 represent integers from 1 to 4； R represents linear or branched Calkyl substituted with hydroxyl, imidazolium or the like, Calkoxy or halogen； Rto Rrepresent H, alkyl, or the like； and Xand Xrepresent hydroxyl, an amino group, or the like.]SELECTED DRAWING: None【課題】１つには、ケラチン繊維が満足のいくように染色されることを可能するのみならず、光安定でもあり、厳しい気候、洗浄及び汗などの、繊維がさらされる可能性がある様々な攻撃に耐える色をもたらすことができ、そしてさらに、水性過酸化水素溶液などの酸化剤の存在下で、繊維の同時明色化をもたらすことができるほど十分に安定である直接染料を提供。【解決手段】式（Ｉ）で表される３芳香族単位を有するアゾメチン型直接染料、及びまたケラチン繊維、特に毛髪などのヒトケラチン繊維を染色するためのそれらの使用。［ｎ１及びｎ２は１～４の整数；Ｒはヒドロキシル又はイミダゾリウム等で置換されたた線状／分岐のＣ１～４のアルキル、Ｃ１～４のアルコキシ又はハロゲン、Ｒ１～Ｒ４はＨ、アルキル等；Ｘ１及びＸ２はヒドロキシル、アミノ基等］【選択図】なし
