I am often asked “What colour will the henna be?” when applied to parts of the body other than hands. Whilst fresh henna and diligent aftercare will maximise your colour potential, the final stain will vary according to the placement on your body, and also your own skin chemistry. Here is, by far, the MOST USEFUL ANSWER I have ever seen online – with a very helpful diagram/map of henna stains:
“Some people get brownish henna stains, and those stains vary across the body.
Stains are darkest where skin is thickest.
Stains last longest where skin is thickest.
Meat eaters, people who are young, people who do not use lotions or alfa-hydroxy or anti-oxidant products, people who are in robust health, people who are happy and relaxed, people who are physically active, people with high metabolisms, people in their sexually reproductive years, menstrual or premenstrual people, and people whose skin is very warm to the touch tend to get very dark or brownish stains.”