Hair dyes differ mainly in how long they hold: permanent colour opens the cuticle and deposits pigment inside the fibre, semi-permanent coats the surface and fades with washing, and temporary sprays cover roots for a single day. This page holds formulas from L'Oréal, Garnier and Schwarzkopf, including oil-rich versions and ammonia-free ones. A skin sensitivity test 48 hours before colouring is not a step to skip, however many times you have coloured without trouble. Avoid washing the hair the day before, since the natural oils protect the scalp. Afterwards, use a shampoo made for coloured hair to hold the shade. Everything here is 100% authentic, with delivery to all wilayas and cash on delivery.