To provide compounds that can produce, in safer conditions than persulfates, powerful lightening, especially lightening of keratin fibers, while minimizing their degradation.SOLUTION: The present invention relates to use of one or more particular pyridinium salts. The invention also relates to a method for the treatment of keratin substances using the salts and optionally one or more chemical oxidizing agents. The invention also relates to a composition for lightening keratin substances comprising one or more pyridinium salts and one or more chemical oxidizing agents. The present invention also relates to one or more particular pyridinium salts and also to compositions containing them, especially compositions comprising a physiologically acceptable medium.SELECTED DRAWING: None【課題】分解を最小限に抑えつつ過硫酸塩よりも安全な状態で強力な明色化、とりわけケラチン繊維の明色化をもたらしうる化合物を提供する。【解決手段】１種以上の特定のピリジニウム塩の使用、前記塩および任意選択的に１種以上の化学酸化剤を用いてケラチン物質を処理するための方法、前記ピリジニウム塩と１種以上の化学酸化剤とを含む、ケラチン物質を明色化するための組成物、並びに、１種以上の特定のピリジニウム塩と、さらにはそれを含有する組成物、特に生理学的に許容可能な媒体を含む組成物とを提供する。【選択図】なし
