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#2
10-09-2016, 09:37 AM
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Good question. Though the commercially sold UV protection is scientifically tested to determine how much UV it blocks-- so they know what percentage it blocks. It's usually like 97% to 99%. How that relates to practice is your question and a good one.
Last edited by drcy; 10-09-2016 at 09:39 AM. 
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