Mercurochrome = "Monkey Blood"?

[Morgainelf]

When I was but a wee elf, my Mom would put Mercurochrome on my cuts and scrapes. It was red, and stung a bit.

She always called it "Monkey Blood". I figured it was just something she made up, until I came across [Link Removed]
So, who else's mom put "Monkey Blood" on their cuts? Is this a regional thing? And how in the world did Mercurochrome get this name, anyway?

BTW, I grew up in Southeastern Louisiana.