Fart lighting

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An attempted fart lighting

Fart lighting is the practice of igniting the gases produced by human flatulence, often producing a flame of a blue hue, hence the act being known colloquially as a "blue angel", "blue dart", or in Australia, a "blue flame". The fact that flatus is flammable, and the actual combustion of it through this practice, gives rise to much humorous derivation. Other colors of flame such as orange and yellow are possible with the color dependent on the mixture of gases formed in the colon.

Although there is little scientific discourse on the combustive properties of flatus, there are many anecdotal accounts of flatus ignition and the activity has increasingly found its way into popular culture with references in comic routines, movies, and television; including cartoons.


The composition of farts varies dramatically among individuals. Flatulence produces a mixture of gases with the following six as major components:[1]

Methane burns in oxygen forming water and carbon dioxide often producing a blue hue (ΔHc = -891 kJ/mol),[2] as:

(g) + 2O
(g) → CO
(g) + 2H

Hydrogen sulfide also combusts (ΔHc = -519 kJ/mol)[3] to

(g) + 3O
(g) → 2SO
(g) + 2H

The odor associated with flatus is due to hydrogen sulfide, skatole, indole, volatile amines and short-chain fatty acids. These substances are detectable by olfactory neurons in concentrations as low as 10 parts per billion, hydrogen sulfide being the most detectable.[4]

Gas production[edit]

Some of the gases are produced by bacteria which live in symbiosis within the large intestines of humans and other mammals. The gases are created as a by-product of the bacteria's digestion of food into relatively simpler substances.[5] The oxygen and nitrogen component of flatus can be accounted for by aerophagy, while the CO2 component results from the reaction of stomach acids (HCl) with pancreatic bile (NaHCO3).


Because the methane, hydrogen sulfide, and hydrogen present are flammable, igniting the resulting gases can result in burns or explosions as well as the desired flame. Clothing, hair, or skin may catch fire and sensitive tissues can be damaged.

Fart lighting has been a novelty practice primarily among males or college students for decades.[6][7]

In popular culture[edit]

Many find a comedic value in fart lighting and the activity is increasingly represented in pop culture possibly because "for adults, the allure of the vulgar is regressionary and often secretly pleasurable."[8]


On the 2nd of May 2000,[13] a U.S. patent was issued for a "Toy gas fired missile and launcher assembly", a product that would allow one's "colonic gases" to be stored for later ignition to "fire the missile into space."[14]

See also[edit]


  1. ^ Van Ness, M. M. and Cattau, E. L. (1985) Am. Fam. Practioner, 31;198-208.
  2. ^ Methane
  3. ^ Hydrogen sulfide
  4. ^ Levitt, M. D. and Bond, J. H. (1978) in Intestinal Gas and Gastrointestinal Disease
  5. ^ BBC - h2g2 - Farts and Flatulence
  6. ^ Dawson, Jim (1999). Who Cut the Cheese?: A Cultural History of the Fart. Ten Speed Press, ISBN 1-58008-011-1. ISBN 978-1-58008-011-8. Retrieved 2007-10-07. 
  7. ^ Mercer, Bobby (2009-04-18). How Do You Light a Fart?: And 150 Other Essential Things Every Guy Should Know about Science. Adams Media. p. 71. ISBN 9781440519871. Retrieved 2 October 2014. 
  8. ^ Twitchell., J. (1992). Carnival Culture – The Trashing of Taste in America. Columbia University Press, New York. p. 52. 
  9. ^ Fart Scenes in Movies
  10. ^ Stern, Howard (1993). Private Parts. Simon & Schuster ISBN 0-671-88016-0. ISBN 978-0-671-88016-3. Retrieved 2007-10-07. 
  11. ^ Weinstock, Jeffrey Andrew (2008). Taking South Park Seriously. Albany, New York: State University of New York Press. p. 169. ISBN 0-7914-7566-2. 
  12. ^ Thompson, Paul (1999-11-06). Waikato Times (Hamilton, New Zealand). p. 14. 
  13. ^ http://www.google.co.uk/patents/US6055910
  14. ^ Zanakis, Michael F.; Philip A. Femano (2 May 2000). "Toy Gas Fired Missile and Launcher Assembly". U.S. Patent Office, Patent number: 6055910; Filing date: Jun 1, 1998; International Classification - F42B 406. Retrieved 2008-01-10. 

External links[edit]