Has my porosity change & can I use henna?

I just coloured (bleach) my low porosity hair blonde and I've noticed that my hair dries very quicker than usual, could this be that my hair is now high porosity? I only highlighted the ends and my roots are my natural colour black. Do I now have low/medium or high porosity? Secondly, how long do I have to wait before I can use rainbow henna to dye my coloured ends red? 

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