Hello, I have a quick question--I am still pretty darn new to henna since I haven't had much chance to practice---which brings me to my question:

There is a Middle Eastern delicious store somewhat local--and they sell henna for the hair.  It doesn't really have much of an ingredient label, but the owner says she uses it on her hair all the time and both she and her husband say it is just ground up henna, that's it, plant material, nothing else. 

The thing I find peculiar, is that it comes in brown, red, neutral, and black.  They said it would be ok to use on the skin--I think they said use brown or red....they might even have said use brown or  black-but they said in all the colors, it's all natural plant material...

In general, should I be concerned about this kind of thing?  I'm sure for a henna connoisseur, the quality might be considered sub par...but I just want to practice on myself, and some friends at this point---is there any reason to believe this would not be ok?