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
Hubert Tonka author Jeanne-Marie Sens founded the publishing house Sens & Tonka. Tonka and Sens co-authored and published several books on architecture. Tonka gave life to the Pneumatic concepts of the "Utopie" group, which advocated ephemeral, inflatable structures. Tonka held extreme left opinions, close to the anarchists, that could be traced back to Rosa Luxemburg and Mikhail Bakunin. Talking of the intellectual roots of the "Utopie" group, Tonka said: In a 1971 interview Tonka said "To imagine ... that it is possible to act politically through urbanism, architecture, and the detournement of either is a dream." He believed that only a revolution