para-Phenyldiamine (PPD) commonly known as "Black Henna" is just plain BAD!
"Black Henna" is just plain bad for you. There is absolutely nothing good to be sad for PPD! It has no good points, even the fact that the very same stuff is used to dye the hair of every Goth on the face of the earth is no reason to applause ~ because using permanent black hair dye also exposes you to the nasty PPD chemical.
Are we exagerating? In a word ~ NO. para-Phenyldiamine gets into your skin and stays there, it causes nasty allergic reactions, and its not just a case of people being allergic to PPD, it's more of a just how much contact you can get away with before you have a nasty reaction.
Just how bad can it get? In a word ~ Horrifying. para-Phenyliamine causes reactions that are painful, itchy and ouze. In many cases the reactions leave scarring even if treated medically. PPD can also cause blindness if it gets in your eyes. PPD exposure can also cause internal damage and has been linked to organ failure, and in at least one case of ingestion, ppd has lead do death.
Just to clarify, "Black Henna" or PPD or para-Phenyldiamine is just plain BAD!