Mix per henna artist per full day's work: 100g of henna powder.
Mix enough lemon juice into the henna powder to make a paste as thick as yoghurt, let it set 12 hours at 75F.
Mix 5 ml, or 1/6 oz of Cajeput essential oil into each 4 oz of mixed henna paste.
Stir out all the lumps and put that in a carrot bag to either use directly or to fill a jac bottle.
Let that sit for 12 hours before using the paste. If there is paste left over from one day, it can be used up to 48 hours later.
Clean the skin first with isopropyl alcohol to remove any skin oil.
Apply the henna.
Let it dry.
Advise the person to try to keep the henna in place for an hour, or a few hours if possible, and then let it fall off. The only aftercare is to mosh, dance, sweat, have fun!
This mix will leave a brilliant orange stain on the skin after 1/2 hour, which will darken to chocolate over 48 hours.
I used henna from Castle Art: both Jamila and regular.