I'm in TWA stage right now but guess is my hair is half 4a half 4b. I did my first henna treatment last week and my hair did get redder but it's only noticable in the light. My curl pattern did loosen some but I've been using amla for the 2 weeks prior, which had been tightening my curls. I plan to alternate between amla and henna as I try to get more vibrant red with out loosing my curl pattern.
BC 10.10.09
Relaxer Free Since 8.21.09
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http://jrnytothenxtlvl.wordpress.com/