Hi guys,
It's full of Caustic and that's definitely not good for the skin. Also having too much of it on hand is also an issue as it becomes weaker everytime you open it up and take some out thus letting more air in with it, thus why I only buy it in smaller quantities.
Also it's better once opened to take it out of its tin and store it in glass, this way it doesn't react with the steel which the tin is made of.
Cheers,
BB.