Hair colouring is the process of changing the natural colour of hair by applying a chemical substance to the hair strands. This process can be done for various reasons, including to cover grey hair, to change the hair colour for fashion purposes, or to create a new look. Hair colouring can be achieved through various techniques, including permanent, semi-permanent, and temporary methods. Permanent hair colouring involves the use of a chemical mixture that permanently alters the natural pigment of the hair. This process involves the use of an alkaline agent, such as ammonia, to open the hair cuticle and allow the colouring agent to penetrate the hair shaft. The colouring agent then reacts with the natural pigment of the hair to create a new colour. Permanent hair colouring is long-lasting and can last for several weeks or even months. Semi-permanent hair colouring involves the use of a less harsh chemical mixture that only partially penetrates the hair shaft. This type of hair colouring is less damaging to the hair than permanent colouring and typically lasts for several weeks. Temporary hair colouring involves the use of a non-permanent hair dye that coats the outside of the hair shaft. This type of hair colouring is ideal for special occasions or for experimenting with new colours, as it typically lasts for only a few washes. Hair colouring can be done at home or by a professional hair stylist. It is important to follow the instructions carefully and to perform a patch test before applying the colouring agent to the entire head of hair to avoid allergic reactions or other adverse effects.
permanent, semi-permanent, temporary, chemical, pigment
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