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Old 05-25-2004, 06:18 PM  
B40
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Join Date: Jul 2001
Posts: 7,020
Here's another thing one of my high school teachers told me. Before you exhale, grab a tissue and put it over your mouth, then exhale over that. Even with the filter, it'll still turn yellow and/or brown, don't know exactly because I've never tried it myself.
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