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Tan colored stools suggest you may have difficulty digesting your fats, which causes congestion in the liver and gall bladder. IBS and yellow stools sometimes occur. Gray/white ashy colored or clay like stools can indicate pancreas or liver problems. Also, possibly gallstones pancreatitis or cirrhosis of the liver.
Clay colored stool happens when the stool or feces appears pale, putty or clay like. Normal stool usually appears in hues of brown or yellow, so stool that appears pale or clay-like reflects a problem in the biliary system.