Probably mucous: The film you are describing is something that is not soluble in water. This could be fat, which you had tested, and it could also just be mucous. Cells in the large intestine secrete mucous, just like other cells in the body. It could also be something you are eating which is not digestible. You would have to keep a diary of foods to figure this out.
Answered 1/12/2014
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A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
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