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The term was coined in 1964 by two Australian researchers, Bear and Thomas, for an article in the journal Nature. In the article, the authors describe how the smell derives from an oil exuded by certain plants during dry periods, whereupon it is adsorbed by clay-based soils and rocks. During rain, the oil is released into the air along with another compound, geosmin, producing the distinctive scent. In a follow-up paper, Bear and Thomas (1965) showed that the oil retards seed germination and early plant growth.
The scent is generally regarded as pleasant and refreshing, and is one of the most frequently cited "favorite smells". In desert regions, the smell is especially strong during the first rain after a long dry spell. The oil yielding the scent can be collected from rocks and concentrated to produce perfume. However, it has yet to be synthesized, perhaps due to its complexity. It is composed of more than fifty distinct chemical substances.
Bear, I.J.; R.G. Thomas (1964). "Nature of argillaceous odour". Nature 201 (4923): 993-995.
Bear, I.J.; R.G. Thomas (1965). "Petrichor and plant growth". Nature 207 (5005): 1415-1416.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Petrichor". A list of authors is available in Wikipedia.|