Hair Coloring Systems Delivering Color With Reduced Fiber Damage
September 2008
in “
International Journal of Cosmetic Science
”
New to copper? There is a guide in the encyclopedia. Read the guide → Studysummary 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.
Our plain-language summary. Not medical advice or a treatment recommendation. Consult a qualified healthcare professional before changing treatment. Full disclaimer
The study demonstrated that the use of permanent hair coloring products could lead to the formation of free radical species, such as hydroxyl radicals, due to the reaction of hydrogen peroxide with redox metals like copper absorbed from tap water. These radicals were shown to cause measurable damage to keratin fibers. The research found that incorporating chelants, specifically N,N′-ethylenediamine disuccinic acid, effectively prevented this metal-induced radical formation, thereby significantly reducing fiber damage. This chelant was particularly effective due to its ability to bind low levels of copper even in the presence of high levels of calcium found in hair.
