Golden,
The conditioning effects of the henna are a by product/same as is the coloring aspect. They kinda go hand in hand if you will. I just did a treatment this past Saturday for coloring, I left it in my hair for two hours under a plastic cap and towel. It is just as sconditioned as when I leave it in for 45 - 1 hour. Only difference is the color is more intense because of giving the terp (Tea Trea Oil) a chance to help the color release.
I didn't use the Neem or Aritha this time and had no hair hardness. I used 100 grams of the Amla, 100 grams of the Henna, 3 tbs of the Skikakai (only cause I ran out
). I did have enough left over for another full treatment, I stored it in a food saver vaccuum sealed bag for next time.
My mom NEVER uses the Neem or Aritha, only the Henna and Amla and has never complained of hard hair.
Also, go give my hair color a chance to 'set', I do NOT shampoo my hair for the first week after treating. I rinse out the henna using DDTA to help loosen the henna from the hair and then do CO Washes the first week as needed (because of perspiration). I read about this on the Henna for Hair Forum. I'll look for it and post back when I find it.
ETA: I did a search in the forum, I couldn't find the original post but it seems that most of the users shampoo their hair immediately without any color loss so I guess It's personal preference.
I did also read on the indigo henna, that you have to level up to the black color if that is what you are going for. Translated: it will take a few applications before your hair is truly BLACK.
HTH.