髪の悩みQ&A

ヘアカラーがすぐに落ちます

ヘアカラーがすぐに落ちます

by gloria » 2015年8月24日(月) 11:47

最近髪を暗くしましたが、2,3回シャンプーすると髪が明るく戻ってしまいました。
どうしてですか?

Re: ヘアカラーがすぐに落ちます

by 髪の悩み.com » 2015年8月25日(火) 22:13

ヘアカラーは、髪の毛に色素を入れて酸化させて固めているのですが、
この「酸化重合」は時間と共にはずれていきます。
これを「褪色」といい、色落ちしたという言い方をします。
元は、髪の中には『メラニン色素』というのがあって
これが黒髪のもとになっているのですが、
ヘアカラーは、色素を入れるだけではなく『メラニン色素を壊す作業』を同時に行います。
この作業のみのカラーのことを「ブリーチ」と呼びます。
ヘアカラーで色が抜けると明るくなる原因は、
メラニン色素がなくなってしまっているのが、原因です。
ヘアカラーというのは、きれいな色・透明感のある色にしたければメラニン色素を削らなければなりません。
ヘアカラーの色持ちは、2ヶ月程度です。
メラニン色素がたくさん残っている場合は、ヘアカラーは長持ちしているように感じますが、
メラニン色素がほとんどない程削られていると、すぐに明るくなります。
その場合は、色素の大きな白髪染めの薬剤を使うことで
カラーの色持ちは長くなります。

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