Jani Kone Henna Paste?

Question

We have a Jani Kone Henna Paste kit that we've had at least 5 years. Can we still use it?

The ingredients are

"Mehendi Powder, Terpinol, C.M.C.(Carbboxy Methyl Cellulose), Sodium Hydroxide, Water"

Answer 1

Yes you can! Those ingredients do not expire. The sodium prevents it from going bad.  

Answer 2

I wouldn't use it, sodium hydroxide-causes skin irritation in low level use.http://www.atsdr.cdc.gov/tfacts178.html

and  after 5 years who knows what has happened to the stuff in the cone. I get great henna here and lovely color too.http://www.hennacaravan.com/