Chemical Burn?

[TheMadMech]

I'm trying to figure out what gave me this small burn on my hand yesterday. I was cleaning out/rebuilding a hydrogen gas regulator. A black powder with gold colored flecks poured out on the table and I assumed it was carbon powder and brass from the valve. I ended up laying my hand in it at some point and felt a strong burning on my knuckle. Sure enough I've got a small minor burn now.

Any guesses on what could have been the cause? The table was brushed off before I started pulling the valve apart.

Also, I normally don't stray out of the tools section so if this is the wrong place, my apologies.

This is my clever signature.

 

[LS6 Tommy]

Special radioactive magic powder??

Tommy

 

[Photon440]

Perhaps it was a metal hydride powder from inside a storage tank?

 

[Boilerhouse]

As hydrogen is the root element of all acids, it sounds like it may have reacted with something to form an acid.