Subject: Tell science behind -henna leves stains skin which is usefull for body dec

Brothers & sisters,
There are many sights on henna on internet But none of them is supported 
by scientists.  My interest is that some scientist should tell me the science 
behind henna.
what chemical reaction does takes place while tinting skin or staining 
skin when it is applied on skin? & is it possible to extract the chemical 
which stains skin from henna leaves?
Thanking you.
atul
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Henna, also called Mehndi, is a temporary body decoration that looks like 
a tatoo but isn't. It is fast, easy, and painless, and most importantly, it is a 
beautiful form of natural body decoration. It lasts for about 12 days, and then 
slowly fades away. 

Henna is a small shrub called hawsonia inermis, and is found in Iran, 
India, Pakistan, Egypt, and North Africa. The young leaves and twigs are ground 
into a fine powder, then mixed with hot water and applied to fingernails and 
hair to give them a reddish-orange color. 

Re: Tell science behind -henna leves stains skin which is usefull for body dec