I have always wondered what these numbers meant. Now I know:
http://www.pslc.ws/mactest/work/recycle.htm
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these links also have good info on not only what the symbols mean, but what each type of plastic is used for and which ones to avoid.
http://www.ecologycenter.org/ptf/toxins.html
http://www.ecologycenter.org/factsheets/plastichealtheffects.html
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