The most important ingredient in any shampoo is the cleansing agent, known as the detergent. The main job of any shampoo is to remove dirt and excess oil. Fifty years ago hair cleansing was done routinely with body soaps. Today we use synthetic detergent shampoos. Hard water, which contains relatively high amounts of calcium, reduces the cleansing power of regular soap and forms a scum deposit. The main advantage of the often expensive synthetic detergent shampoos is that, unlike basic toilet soap, they may be used with hard water without leaving a scum residue on your hair, which in turn can leave your hair dull, lusterless, and difficult to comb or manage.
But for this property, however, synthetic detergents are really no better hair cleansers than regular soap. Besides, scum deposits can be rather easily rinsed off your hair with acidic substances such as lemon juice, vinegar, and beer. In fact, it was probably from their original use-rinsing hard water soap scum from hair-that lemon juice and beer earned their reputation as being especially good for hair. Other than their mild acidity, they have no special properties.
Synthetic detergents are sometimes referred to as surfactants-chemicals that have the ability to grab hold of oils and greases, at the same time attracting water to rinse them away. Cosmetics chemists have created literally dozens of surfactant detergents, which are usually classified in four basic groups: anionic, cationic, amphoteric, and non-ionic detergents. Shampoos generally contain more than one detergent. Those intended for normal and oily hair are formulated by increasing the amount of strengths of the detergents. Shampoos for dry hair contain conditioners, compounds that restore some of the oils that the detergents in the shampoos wash away, in order to moisturize the hair.
In summary, a shampoo is basically a cleansing cosmetic for your hair and is quite similar to a mild dish-washing liquid. In fact, if you wish, you could safely use a mild commercial dish-washing liquid for shampooing your hair and save a fortune.
Category: Hair fall