Can you elaborate on how and when to use Henna?

Reader: Can you elaborate on how and when to use Henna?
Thanks

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LHDC: Ok, I'm sure you've read how much I LURVE henna, right?  Well, it's TRUE!  I really don't know how I lived without it!
 
I use it every 4-6 weeks and my recipe has changed since I've started using it a year ago.  Now it is much less involved. 
 
I mix water into the powder until it is the consistency of yogurt.  I put in some essential oils and sometimes ACV and that's it. 
 
I coat my hair VERY thoroughly with the mix and leave it on my hair for several hours up to overnight. 
 
I wash it out with shampoo.
 
Henna is VERY messy at first, and it has a funny smell to it and it looks like straight doo-doo, but OH HOW I LOVE MY HAIR after a henna treatment! 
 
It is always much stronger and more manageable.
 
Henna's not for everyone, but it is definitely for me :)
 
I hope that helps and thanks for giving me the chance to rave about henna!!!