Question:  Why does the Henna & Jagua stain my arm so much lighter then my hands?  I've tried a couple of different things to get a darker stain but nothing seems to help.
 
Well, first off, there might not be anything wrong with the stain your getting.  The stain that is achieved on the arm is always lighter than the hands and feet.  That's because the skin is thinner on the arms.  You'll get a darker stain where the dead skin layer is thicker.  You can always use high quality, current crop henna and Jagua and follow all the directions and helpful hints to get a darker stain but in the end what you get, is what you get.  There are other factors such as life-style, medications and recent activities like tanning, swimming and various skin treatments that can affects how dark your tattoo gets.
 
The two pictures below show the henna paste on the skin and a typical stain for an upper arm.  This picture was taken 4 days after application so it's reached it's darkest point.  Yours may be lighter or darker.  This is just an average.  So if your tattoo is in this range your doing pretty well.