Mystery hobby no. 2

Don't look too close at this picture.

If you do, it will give you a large clue as to what this mystery hobby is.

So, if you want to cheat, look.

If you aren't a cheater, scroll to the last photo.

This stuff stinks.

And you should inhale as little as possible.
And...remember, it could be dangerous.
So don't swallow it.
Or dump it in your eyes.