PROBLEM TO BE SOLVED: To provide a useful photosensitive acid hair dye composition stable even if being strongly acidic, high in fluidity, good in touch feeling in use, free from color migration to the skin, clothing, etc., after use, needing no rinsing, unremarkably hiding gray hair in a single use, dyeing the hair including gray hair to stable color in use four to five times, excellent in color fastness, thus high in practicability.SOLUTION: The photosensitive acid hair dye composition is such as to essentially contain 0.01-1% of an acid dye and 0.01-5% of a silver salt and be compounded with 0.1-10% of an acid as pH adjuster, 1-20% of an aromatic alcohol as penetrant, 1-30% of a lower alcohol as solvent, 0.01-5% of a polymeric compound as thickening agent, and 0-5% of sulfur.COPYRIGHT: (C)2008,JPO&INPIT【解決手段】酸性染料を0.01~1%と銀塩を0.01~5%を必須成分とし、pH調整剤としての酸を0.1~10%、浸透剤としての芳香族アルコールを1~20%、溶剤としての低級アルコールを1~30%、増粘剤としての高分子化合物を0.01~5%、イオウを0~5%を配合してなる感光性酸性染毛料組成物【効果】 強酸性であっても安定であり、流動性に富み、使用感触に優れ、使用後の皮膚、衣服等への色移りがなく、洗い流すことを必要せず、1回の使用で白髪を目立たなく隠し、4~5回の使用で白髪等の髪を落ち着いた安定な色に染毛することができ着色堅牢性に優れている。【選択図】なし
