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A quick test for fecal contamination of water sources or soil is a check for the presence of E. coli bacteria performed with the help of McConkey agar plates or Petri dishes. E. coli bacteria uniquely develop red colonies at temperature of approximately 43 °C (110 °F) overnight.

While nearly all strains of E. coli are harmless, their presence is indicative of fecal contamination, and hence a high possibility of other, more dangerous organisms like hepatitis.

Human feces

Main article: Human feces

Human fecal matter varies significantly in appearance, depending on diet and health. Normally it is semisolid, with a mucus coating. Its brown colouration comes from a combination of bile and dead red blood cells. In newborn babies, fecal matter is initially yellow/green after the meconium. This colouration comes from the presence of bile alone. In time, as the body starts expelling excess dead red blood cells, it acquires its familiar brown appearance, unless the baby is breast feeding, in which case it remains soft, pale yellowish, and not-unpleasantly scented until the baby begins to eat significant amounts of other food. Throughout the life of an ordinary human, one may experience many types of feces. A "green" and sometimes "clay-like" appearance to the feces is a result in a lack of blood cells expelled. Bile overload is very rare, and not a health threat. Problems as simple as serious diarrhea can cause blood in one's stool, turning it black. Food may sometimes make an appearance in the feces. Common undigested foods found in human feces are seeds, nuts, corn, and beans, mainly because of their high fiber content.

See also

• Intestinal parasite
• A1 broth
• Manure
• Scatology
• Guano
• Shit

External links and references

• Short but detailed biological explanation of why feces are brown
• Liver biochemistry
• History of Shit by Dominique Laporte. ISBN 0262621606

• Animal physiology
• Waste