Maybe, but is also highly corrosive acid. Much stronger than anything I ever ran into at the lab. It's got a sulfur base, though. That's what I smelled.
9 seconds sound clip from the The Flight of Dragons movie soundboard.
You can hear this line at 01:14:51.043 in the Blu-ray version of the movie.
Quote context
[...]
- Wait. I know that smell. Don't go near it!
- Take one of your arrows and shoot it into the stream.
- Waste an arrow? Will need all we have.
- By my father. What is that slime?
- Dark magic, that's what! Dark magic!
- You do speak in riddles, old man.
- What's causing the horrible muck?
- If Lancer can get me in and out quickly enough, I believe I can behead the scummy thing.
[...]