Hair dye is a product used to change the color of hair. It works by penetrating the hair shaft and depositing pigments, which can be natural or synthetic. There are several types of hair dye available on the market, including:
• Temporary hair dye: These dyes only coat the hair shaft and wash out after a few shampoos. They are often used for special occasions or to test out a new color before committing to a permanent change.
• Semi-permanent hair dye: These dyes last longer than temporary dyes, usually around 4 to 12 washes. They do not contain peroxide or ammonia and are less damaging to the hair.
• Permanent hair dye: These dyes contain peroxide and ammonia, which open up the hair cuticle to allow the pigments to penetrate deep into the hair shaft. They can last for several weeks to months and provide a long-lasting color change.
It is important to note that hair dye can cause damage to the hair, especially if used frequently or if the hair is already damaged. It can also cause skin irritation or an allergic reaction in some people. It is recommended to do a patch test before using hair dye, especially if you have sensitive skin.
Also, some hair dyes contain certain chemical ingredients like PPD (para-phenylenediamine) that can cause allergic reactions and skin irritation, so it is important to be aware of the ingredients in hair dye and to do patch test before use.