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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.
Bile is what gives stool its brown color, so if bile is not being produced or if the bile ducts are blocked, the result could be stool that is light. Common causes of stool that is pale or clay colored include: 1  Alcoholic hepatitis.  Biliary cirrhosis.