Typically higher porosity will take less time to dry.

Lower porosity hair will take longer to dry and you might notice that certain products almost feel as though they're just sitting on your hair.

Hair that has been damaged by lots of heat and/or coloring will tend to be higher in porosity. But the use of heat or color doesn't necessarily mean you automatically have high porosity hair. I've colored my hair (not frequently) and have my hair straightened 2 or 3 times a year and my hair analysis showed normal porosity.

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Modified CG since 11/5/11
CLEANSE: CJ Daily Fix, DevaCare No-Poo, CHS Treatment Shampoo
RO: SS Caitlin's Conditioner, CJ Beauticurls Strengthening
LI: SS Repairing Protein Treatment, CHS Silk Leave-In
STYLE: Re:Coil, Curl Keeper, Deva Ultra Defining Gel, Curls Rock Amplifier,Sweet Curls Elixirs Okra Gel and Hard Hold Gel, SS Curl Enhancing Jelly and Firm Hold Gel