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A secret ingredient is a component of a product that is closely guarded from public disclosure for competitive advantage. Sometimes the ingredient makes a noticeable difference in the way a product performs, looks or tastes; other times it is used for advertising puffery. Companies can go to elaborate lengths to maintain secrecy, repackaging ingredients in one location, partially mixing them in another and relabeling them for shipment to a third, and so on. Secret ingredients are normally not patented because that would result in publication, but they are protected by trade secret laws. Employees who need access to the secret are usually required to sign non-disclosure agreements. ==Notable secret ingredients== *Glutamate, an amino acid and flavor enhancer, often used in Chinese dishes. *Merchandise 7X, the "secret ingredient" or "secret formula" in Coca Cola. The ingredient has remained a secret since its invention in 1886 by John Pemberton. The description of the ingredient is kept in a vault at the Trust Co. Bank in Atlanta. *KFC's "Colonel's secret recipe", created by Colonel Sanders in the 1930s. The recipe, which is advertised as containing "eleven herbs and spices",〔(About Us ) KFC. accessed October 7, 2011.〕 remains locked in a vault in Louisville, Kentucky.〔(【引用サイトリンク】title=Secrets of the food industry ) 〕 *Special sauce, thought by some to be the variant of Thousand Island dressing used in the preparation of a McDonald's Big Mac hamburger.〔Poundstone, William (1983). ''Big Secrets''. William Morrow and Company. ISBN 0-688-04830-7.〕:23 According to Sarah J. Gim of ''The Huffington Post'', the special sauce is thicker, sweeter and has a "slightly different taste".〔Gim, Sarah J. ("Secret sauce is not Thousand Island dressing" ). ''The Huffington Post''. July 17, 2006〕 The ingredients for the special sauce are available on McDonald's website. McDonalds decided to not only reveal the ingredients of the special sauce, but also the method used to make it. *Frank's Red Hot, the secret ingredient in the first Buffalo wing sauce. * The "theme ingredient" on the original series ''Iron Chef'' (the primary ingredient with which competitors prepare their dishes) is called the "secret ingredient" on the successor series ''Iron Chef America''. *Barr's Irn Bru secret recipe created by Robert Barr in 1901. Irn Bru is a slightly citric drink. *Worcestershire sauce, a hot and spicy sauce used as a marinade and sauce for many dishes. *Chartreuse liqueur, a green or yellow alcoholic drink made by the monks at a monastery in France. The secret of the 130 herbs used in its preparation is known to only two monks. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Secret ingredient」の詳細全文を読む スポンサード リンク
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