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How should the Rf value of pure aspirin compare to the Rf value of crude aspirin...

How should the Rf value of pure aspirin compare to the Rf value of crude aspirin made from salicylic acid. Why?
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The Rf value of pure Aspirin is 0.606 while the Rf value for the crude Aspirin is 0.590. The Rf value of crude product is less than that of pure product. This is because in crude product, saliciylic acid which is the starting material, is present in little amount as impuity and interacts with aspirin to form hydrogen bonding and increases the polarity of crude aspirin while this type of interactions are not present in the pure aspirin. Therefore, Rf value of pure aspirin is higher than that of the crude aspirin.

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