Repair for lightened hair?

Over the last decade hair lightening has become more and more popular among women all over the world. Blond hair colours are among the best-selling shades. Even grey to white hair has become a trend among young consumers, allowing also for fashionable effect shades such as temporary pink, red or blue hair colours and strands. 

Hairdressers and cosmetic hair experts know that strong lightening of hair not only decomposes the melanin pigments but also affects the keratin inside the hair fibre. Lightening of naturally dark hair such as brown or even black hair by up to 9 shade levels requires successive bleaching steps with harsh bleaches containing up to 9 % hydrogen peroxide comprising peroxydisulfates as oxidation boosters, thus leading to significant oxidation of amino acids, especially cystine (and cysteine) to cysteic acid.

With the help of biophysical test methods such as tensile strength evaluations* as well as multiple grooming tests keratin damage can be quantified.