THE CHOICE
Temporary colors are usually water based and are applied to pre - shampooed , wet hair . They work by coating the outside , out cuticle layer , of the hair .The color washes away in hte nnext shampoo . Temporary color are good for a quick , but fleeting , change or for counteracting discoloration in blonde or white hair . Color setting lotions combine a colour that washes out with a strong setting lotion . They are similar to temporary colours and are perfect for adding tone to grsy , white , or bleched hair .
Semi permanent colours give a more noticeable effect thath lasts for six to eight shampoos .They can only add, enrich , or darken hair colour, they can not make it any lighter .Semi - permanent colours penetrate the cuticle and coat the outer edge of the cortex ( the inner layer of the hair ) . The colour fades gradually and is ideal for those who want to experiment but dont want to commit themselves to a more permanent change .
Longer laasting semi permanent colour remain in the hair for 12-20 shampoos and are perfect for blending in the first gray hairs .The colour penetrates even deeper into the cortex than in semi permanent colours. This type is perfect for a more lasting change .
Permanent colours lighten or darken ,and effectively cover white . The colour enters the cortex during the development time ( around 30 mins ) after which oxyen in develop swells the pigments in the colorant , and hold them in . The roots may need retouching every six weeks . When retouching it is important to colour only the new hair growth . If the new colour overlaps previously treated hair there will be a build - up of color from the mid lengths to the ends , which will make the hair more porous.
