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Answered 2014-06-13 22:37:42

The lipid molecules fill in air bubbles in the paper fibers. This makes the lipids, also known as fats, leave stains on a brown paper bag.

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Why is uncoated paper used to test lipids?

It depends on what coats the paper, but my guess is that the coat would prevent the lipid from absorbing into the paper. For a lipid test to work, the lipid has to be absorbed to determine if the paper becomes translucent.


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Sudan red can be used to test for lipids. It is soluble in lipids so it will turn the entire sample red. Also, you can do the brown paper test. Put a few drops of the suspected lipid onto a brown paper bag. If the substance is a lipid, it will turn the spots translucent.


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What is the difference between Sudan IV Lipid Test and Translucence Lipids Test?

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