My friend uses henna on her hair, however her hair is very dark. You should not use it on blondes. I find the best product to use on blondes to keep the brassiness out, is Aveda Blue Malva. The shampoo is actually blueish purple, but it's great stuff. What do you think about the products that have hemp in them? Like shampoo, conditioner, tanning lotion etc..

to have a nice hair,i think very important especially for females,so i think to be hairdresser would be one of most profitable job

Yes you live and learn indeed - but I has taken many many disasters to learn that! I have found that the more you try to change your hair and make it more beautiful, the worse it becomes. I now leave it to be its natural mid-blonde colour and straight and I dont have anymore problems! Accept what you have and dont try to bleach or perm it - that is my advice!