I don't know if my hair is high, normal, or low porosity. How do I do the porosity test and how will I know how porous my hair is?? Anybody's input would be helpful. Thanks =)

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Hair type: 4b/4c
Last perm: February 2011
Big Chop: October 2011
Reason for Transition: 1. perm chemicals are my hair's arch nemesis 2. desire to restore health and growth