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
Vanilla ice cream the middle of the eighteenth century, French recipes for ice cream started to include egg yolks. When the use of vanilla in foods and drinks became independent of cacao, it became more prominent in French recipes. The French used vanilla to flavor French vanilla ice cream. Vanilla ice cream was introduced to the United States when Thomas Jefferson discovered the flavor in France and brought the recipe to the United States. During the 1780s, Thomas Jefferson wrote his own recipe for vanilla ice cream. The recipe is housed at the Library of Congress. To make ice cream in the United