In an interview with US Weekly, Waterhouse explains her reasoning behind her unorthodox choice in hair rinse. The British model states, "I don't like my hair when it's washed — it's fine and limp — but Coca-Cola makes it tousled, like I've gone through the Amazon or something." We're all about looking effortlessly cool, but we were curious about the science behind whether or not Coke is a viable hairstyling resource.
HairFinder.com claims the tousled texture of freshly Coke-rinsed hair can be attributed to the soft drink's acidity. To go into more detail, they note:
Coca Cola contains phosphoric acid. This means that the solution of Coca Cola has a very low pH level (Coca Cola Classic has a pH of 2.5). As an acidic solution, when applied to the hair, it causes the cuticle of the hair to contract (or tighten) and will make the hair appear smoother and shinier. This also means that the hair (particularly hair prone to curl) will have its natural curl enhanced.
The logic behind this explanation makes sense, but we have to emphasize that Coca-Cola does not add curls to hair. Rather, it enhances curls and waves that are already present. We should also note that this rinse isn't something you should do on a daily basis or if your hair is fragile, because of both potential damage and gunky sugar buildup (which is just as unpleasant as it sounds). Use your best judgement and be sure to do your research before attempting the rinse on yourself.
Despite these warnings, there are a few people willing to put their hair on the line. As part of her "Fail or Holy Grail" series, YouTuber Ellko arms herself with two bottles of Coca-Cola, a bowl, and her curiosity in this entertaining video. By actually performing this rinse on her hair and observing the results, she offers an opinion on whether or not this hair hack makes a difference in her hair's texture. Watch the video below to see her results, and don't forget to tell us what you think in the comments below.
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Source: http://hairaddiction.collectivepress.com/she-puts-the-coca-cola-rinse-to-the-ultimate-test---fail-or-holy-grail/?s=xpromo