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
Tonka (fuel) which has a (sea level) Isp of 219 seconds. popularized this ignition arrangement. Triethylamine / xylidine mixtures composed the TX and TX2 fuels of the French SEPR rocket engines of the 1950s, used for auxiliary rocket power in the Mirage IIIC. In aircraft use, TX fuels were later replaced by non-toxic kerosene jet fuels, simplifying fuelling of the aircraft. Little change was required to the engines but as this was no longer hypergolic with nitric acid, a small tank of TX was retained for ignition. The use of Tonka by amateurs is not advised, as the exact proportions of ingredients