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 permanent hair coloring  -  dying hair

How it works, method, hair colouring products, hair colours, tips & tricks.
| More information abour bleaching hair | highlighting |

"Permanent" hair colouring products consist of two components that are mixed together immediately before application - the "hair colourants" and the "developer" (hydrogen peroxide).

A permant hair colouring product penetrates deeply into the hair shaft and are permanent - they cannot be washed out.


Your hair actually has to grow out over time. Regular touch-ups every four to six weeks are generally needed to eliminate roots (hair with your natural colour growing at half an inch per month from your scalp) and refreshing your colour.

Most permanent hair colours use a two-step process (usually occurring simultaneously) which first removes the original color of the hair and then deposits a new color.

Ammonia opens the cuticle and allows the hair colour to penetrate the cortex. Peroxide is used as an oxidizing agent which removes pre-existing colour. As the natural pigment molecules (melanin) are decolourized, the new dye molecules are bonded to the cortex.


Breastfeeding and hair dyes

Pregnant women and women that are breastfeeding should avoid these kind of chemicals. Some studies have shown that permanent or oxidation dyes can be absorbed through the pores of the scalp and flooded into the bloodstream within minutes of exposure.

In addition to the permanent dyes, the semi-permanent and perm treatments have proven the same effect. Due to the sensitivity involved during pregnancy, it is strongly advised you avoid these chemicals. Once in the bloodstream, they quickly pass through the placenta to your unborn baby.

Luckily some dyes are acceptable. Temporary rinses which only coat the hair shaft (not penetrating the scalp), and natural henna treatments can be used. Whatever you decide, please analise the risks before taking any action you may regret.





  • Kelly ClarksonMost styling products contain alcohol which dries out your hair (weaken the hair shaft) and is especially bad for hair that is chemically treated.


  • In order to choose the right hair colour you need to make this choice based on a personal analysis of your natural hair colour, eye colour and skin tone. Experts say you also can't miss if you return your hair to its colour when you were a teenager!


  • Don't wash your hair for 2 days before you dye it. Your hair will absorb the dye better that way.


(Bleached) Blondes watch out!

Help, my hair turned green!

After swimming in the pool bleached blonde hair ocasionally can turn green. Many people think it is caused by chlorine, but the green discoloration comes from swimming in pools with copper plumbing! Mineral deposits of copper from the plumbing are dissolved in the water and then cling to the hair shaft (source: Cutis, July 1995, pages 37-40).

If the hair has been bleached blonde it is damaged and has more absorbency to hold the copper-bearing water and turns really green. It will disappear after several shampoos or you can dissolve a vitamin C tablet (Ascorbinacid) in lemon juice. Another solution can be to wash your hair with a dissolved aspirin tablet (Acetylsalicylacid/ ASS) in water.



Hair colouring disasters

If you are not satisfied with your new permanent hair colour you can correctively colour your hair back to a colour simular to your natural hair colour.

The only one who is able to do this job profesionally is your hair stylist.