5 citations
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January 2004 in “Journal of applied polymer science” This study found that adding urea to a polyethyleneimine solution improved the coloring ability and color fastness of low-temperature hair dyeing with acid dye by enhancing dye penetration into the hair.
6 citations
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October 2003 in “Journal of applied polymer science” 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.
1 citations
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September 2008 in “International Journal of Cosmetic Science” This study demonstrated that using chelants like N , N ′ ‐ethylenediamine disuccinic acid in hair coloring products can significantly reduce keratin fiber damage by preventing the formation of metal-induced free radicals.
Hair coloring and bleaching can permanently break down hair protein and temporarily change its properties.
June 2017 in “University of the Arts London Research Online (University of the Arts London)” This study compared the effects of three compounds on structural and sensory benefits for bleached hair when applied with or after bleaching, observing that their application may mitigate bleaching-induced damage.