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Topic: relative strengths of unscreen active ingredients  (Read 1854 times)

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Offline yuriljx

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relative strengths of unscreen active ingredients
« on: January 25, 2010, 01:15:43 PM »
All right this is the question i spend a long time to solve:

Predict the relative strengths of some common sunscreen active ingredients, PABA, homosalate, and zinc oxide.
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