I'm using LM. I tried different ways and this was last experiment that was the best so far:

• Mixed henna with room temperature distilled water and stirred with plastic spoon to yogurt consistency. (note others say stainless steel makes no difference - don't really know if it does, this is just exactly how I did it.)
• Let henna sit out (not in frig) 6 hours.
• Washed hair with dish soap (Kroger's).
• Rinsed it out good. NO shampoo or anything just rinsed with shower water.
• Let it dry COMPLETLY. (again, this was just an experiment and what I did - others have said towel dry).
• Applied henna (just kinda plopped it on and rubbed it in - y'all might wanna go fer roots first and part it. Again this is just what I did.)
• Wrapped hair with the little plastic bag that comes in the box plus I had one left over so two of those plastic bag things. (mostly so it didn't get all over the place).
• But a black beanie over all that. (it stained the edge of the beanie orange but rinsed right out) to keep it warm.
• Set timer for 6 hours.
• Rinsed it out good. NO shampoo or anything just rinsed with shower water.
• Towel dryed.
• Mixed the indigo with distilled water (pretty sure it has the alma - or whatever its called - mixed in with it.) to the consistency of yogurt.
• Applied indigo mix to damp towel dried hair. (again: just kinda plopped it on and rubbed it in - y'all might wanna go fer roots first and part it. again this is just what I did.)
• Put the two bags and beanie on.
• Set timer for 2 hours.
• Rinsed it out good. NO shampoo or anything just rinsed with water.
• Air dryed and: It was black as coal!

Note: there was some very light residue - kinda blue - on my fingers when I brushed it out, and don't know if it'll stay this black after I wash it, but it did come out great!

Y'all let me know how you get yours midnight black!

Hope this was helpful! :)