Vanilla pulp used in papermaking, in which the lignin is broken down using sulfites or sulfates. However, vanillin is only one of 171 identified aromatic components of real vanilla fruits. The orchid species "Leptotes bicolor" is used as a natural vanilla replacement in Paraguay and southern Brazil. In 1996 the US Food and Drug Administration cautioned that some vanilla products sold in Mexico were made from the cheaper tonka bean which as well as vanillin also contains the toxin coumarin. They advised consumers to always check the ingredients label and avoid suspicously cheap products. In the United States, castoreum, the exudate
Sichuan cuisine unusual custom in other parts of the country. The salt produced from Sichuan salt springs and wells, unlike sea salt, does not contain Iodine, which lead to goiter problems before the 20th century. Sichuan cuisine often contains food preserved through pickling, salting and drying. Preserved dishes are generally served as spicy dishes with heavy application of chili oil. The most unique and important spice in Sichuan cuisine is the Sichuan pepper (). Sichuan peppercorn has an intense fragrant, citrus-like flavour and produces a "tingly-numbing" () sensation in the mouth. Other commonly used spices in Sichuan cuisine are garlic, chili peppers,