I have fallen in love with Zenia, granted it's the only one that I have tried. I just henna'd my hair for the first time two or three weeks ago, and loving the results. I used Zenia's henna and cassia to get more of a natural red tone, and it came out exactly how I wanted it. I did use chamomile and a hint of lemon for mixing.
Do you have any tips for getting the dye to release easier? Or what might make a good warm place?