PROBLEM TO BE SOLVED: To provide an external preparation for dyeing, which has excellent stability, dyeability and safety by using a melanin precursor and/or a natural dye.SOLUTION: It is found to obtain stabilization by dispersing or dissolving one or two or more kinds of dyes selected from the group consisting melanin precursors and natural dyes in a high concentration aqueous solution of a certain polyoxyethylene addition-type nonionic surfactant having an IOB of 0.6 or more and 1.3 or less, in the presence of a water-soluble antioxidant. It is also found to obtain an external preparation having excellent stability, dyeability and safety by mixing a surfactant composition comprising this dye with an external preparation.COPYRIGHT: (C)2014,JPO&INPIT【課題】メラニン前駆体及び/又は天然染料を用い、優れた安定性、染色性、安全性を有する染色用外用剤を提供する。【解決手段】メラニン前駆体、及び天然染料からなる群から選択される1種又は2種以上の染料を、水溶性抗酸化剤の存在下で、IOBが0.6以上1.3以下である特定のポリオキシエチレン付加型非イオン性界面活性剤の高濃度水溶液に分散、もしくは溶解させる事で、安定化する事を見出した。またこの染料を含む界面活性剤組成物を外用剤に配合させる事で、優れた安定性、染色性、安全性を有する外用剤となる事を見出した。【選択図】なし
