My mom mixed  400g of 100% pure body art quality henna from Mehandi with lemon juice until it was about as thick as stirred up yogurt.  She laid that into my hair, sectioning carefully, and got every last bit of hair totally slathered in henna.   She covered that with plastic wrap and left that there for 2 hours, then I rinsed it out. 

That made my hair very dark auburn, and very soft.  The curl was much looser and it was easy to comb (which is unusual for me!).

Then Mom mixed 400g of indigo from Mehandi with water for 10 minutes. She got that into my hair, wrapped that in plastic wrap,  and left it for about 45 minutes.  The indigo kept trying to drip and run, leaving blueberry ripple ice cream looking trails, so there was a lot of diving for towels to keep it mopped up.  Indigo stains towels dark blue!!!!!   All the indigo on the skin scrubbed off in one go.  I rinsed the indigo out of my hair.  Once my hair was dry, it was absolutely gorgeous!  Glossy blue black, with loose curls. 
 

1. Your phone number
2. Your question
3. When to call you (including time zone)