PROBLEM TO BE SOLVED: To provide a measuring method having excellent accuracy and no dispersion of measured values, capable of measuring easily the discoloration degree of a hair dyeing agent.SOLUTION: In this measuring method of the discoloration degree of the hair dyeing agent, a keratin film is used as a dying object, which is acquired by bringing hair keratin protein solution in which hairs are dissolved by a protein modifying agent and a reducing agent into contact with solution for development, and then by drying it.COPYRIGHT: (C)2010,JPO&INPIT【課題】測定値のばらつきがなく、染毛剤の褪色度を簡便に測定することができ、しかも精度に優れた測定方法を提供する。【解決手段】毛髪を蛋白質変性剤および還元剤により溶解させた毛髪ケラチン蛋白質溶液と、展開用溶液とを接触させ、乾燥させた後に得られるケラチンフィルムを染色対象として用いることを特徴とする染毛剤褪色度の測定方法。【選択図】なし
