Even when opposed with rebellion the God will teach the truth with evidence so the excuse of not knowing can not be used. read this ladies, and you will see that extreme heat causes the same effect on the natural chemical in your hair like perms and relaxers do. flat irons and other heated objects breaks the bonds of the keratin in your hair the same as chemicals do. lets stop lying like we still natural when we are not. teach the truth enjoy this info. Naturally, this is a good property since hair — especially long hair — is normally subjected to a large amount of stress, and one would not want hair breaking or changing its shape because of this everyday wear and tear. However, when people do want to change the shape of their hair — get rid of curls, add curls, make it wavy, make it straight — these disulphide bonds pose a great problem. Most hair-straightening techniques, therefore, target these bonds. An easy method of breaking these bonds is using heat. This brings us to what is probably the most common technique for straightening hair — the flat iron. The plates of the iron are usually heated to high temperatures, generally between 300 and 500 degrees Fahrenheit. When hair is passed through the iron quickly, while being held tight and straight, the extreme heat causes the disulphide bonds to break. This breakage allows the keratin chains to move around slightly and assume a position that results in straightened hair. When the hair cools down, the disulphide bonds between the keratin are reformed. Because the keratin molecules are in different positions when the bonds are reformed, the hair stays in the straightened shape for a long period of time. As most people who use flat irons know, this method of straightening hair is not permanent. Exposure to moisture causes the hair to revert back to its original shape. Permanent hair straightening techniques use harsher methods, with chemicals, to break the disulphide bonds and reform them. The disulphide bonds cannot be broken apart by oxidizing agents, which are acids, but can be broken apart by strong reducing agents, which are bases. Alkaline solutions, therefore, are applied to hair to break apart the disulphide bonds. The hair is then held straight and acidic solutions are applied to it. thetartan.org/2009/11/9/scitech/howthingswork
Posted on: Sat, 26 Oct 2013 15:33:02 +0000
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