semi - permanent hair colouring products
The manufacturers only call them "semi"-permanent hair colouring products, they have some ability to embed themselves into the top layers of the cuticle and diffuse into the cortex. The actual dyes used in semi-permanent products are pre-formed, meaning they don't require peroxide or ammonia to be assemled, developed or embedded into the cuticle.
Just like colour rinsing no physical change of any kind takes place within the hair. The colour pigments only penetrate deeper into the cuticle and therefore the colour will last longer than a colour rinse.
Semi-permanent hair colours can make your hair only a little brighter or darker.
Semi-permanent colours fade a bit with each washing, so there is no discernible grow-out. Instead, the colour fades away until all that remains is your own colour. Just as with temporary hair colours, lighter shades of hair wil pick up semi-permanent hair colour more noticeably than darker shades.
If you already have coloured or bleached hair it is not to be advised to use a semi-permanent hair colour - the results are unpredictable.
Both colour rinses and semi-permanent colour products can only camouflage up to 10% gray. They are formulated to stay on the hair for 6 to 12 washings.
Between applications you can use a color shampoo to enhace your colored hair. If you have up to ten per cent grey hair it will cover up 50 per cent grey.
Highlights can be achieved by using different techniques, like for example using a comb, foil (also called colourbourd technique), cap or "balliage." This technique paints bleaches paint onto sections of hair to create noticable layers and lines of lighter colour. Generally it is not applied to the roots, so no regular touch-ups every four to six weeks!
Highlights which have been made by using a special cap can become darker after a while. The reason is that during the bleaching process the locks are binded and for a week they hold on to locks. After every hair wash and hair styling the hairs mix more and more with the remaining hair, so it seems the hair looks darker.
So it is not the locks themselves which become darker, but the separate hairs mixing with the other hairs. If you make larger locks then the beautiful, yellow blond will be kept longer.
Tip:If you don't know which highlight colours to choose get some advice from your hairdresser - colourist. You might ask him to test a couple of highlights in your hair (on the back of your neck).
plant - based hair colour - henna
Often the main ingredient of plant-based colouring products is henna (more about henna, see below) mixed with other plant dyes like indigo, camomile, senna,... more
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