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Bright red streaks may indicate bleeding low in the GI tract, while tarry black or maroon stools can be caused by bleeding in the stomach or small intestines. Clay-colored or pale yellow stools can be caused by problems with the liver, gallbladder or pancreas.
The color of stool normally is brown. The reason for the brown color is the presence of bile in the stool. Bile is made by the liver, concentrated and stored in the gallbladder, and secreted into the intestine to aid in the digestion of food.Depending on the amount of bile it contains, the normal stool color can range in color from light yellow to almost black.he reason for the brown color is the presence of bile in the stool. Bile is made by the liver, concentrated and stored in the gallbladder, and secreted into the intestine to aid in the digestion of food.