New Method of Dyeing Keratin Fibers Using Poly(Ethylene Imine) and Its Coloring Mechanism

    October 2003 in “ Journal of applied polymer science
    Akio Kuzuhara, Teruo Hori
    Studysummary This study found that using poly(ethylene imine) as a counterion reagent improved the colorability and shampoo fastness of bleached human hair when dyed with an acid dye.
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