Mbbs Essay

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* What is hair colouring? Hair coloring is the practice of changing the color of hair. Common reasons are to cover grey hair, to change to a color regarded as more fashionable or desirable, and to restore the original hair color after it has been discolored by hairdressing processes or sun bleaching. Not only does coloring change hair cosmetically, it also changes the cellular structure of hair. Once dyed, hair cannot be restored and will never revert back to its natural, state. Over 90 million people dye their hair regularly. Many more say they will once they start to turn gray, and many girls use hair dyes from an early age. However, there are risks associated with using these products. One of the main chemicals in most hair dyes - P-Phenylenediamine, PPD has been banned in several European countries, and hair dye chemicals have been shown to have a variety of harmful effects . Use of hair dye has been linked to allergic reactions, respiratory disorders and even cancer. * Overview Tiny particles called colour pigments determine the colour of hair. Lighter hair possesses less pigment than darker hair. The amount of color pigment you have is determined by genetics. However, you can change your color by bleaching or dyeing your hair. When you color your hair, you are essentially removing or adding color pigment depending on whether you want to go lighter or darker. The hair's cortex layer, or middle layer, houses pigment, while the cuticle layer holds pigment in place with tiny cells that lie closely together and overlap like roof shingles. During the coloring process, the cuticle layer is opened so pigment can be removed or added. At the end of the process, the cuticle layer is smoothed back down in order to hold the new color in place. Melanin proteins found in the hair are: eumelanin, which creates hair shades from black to brown, and phaeomelanin,

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