So I ordered a box of Green Vert Amazone cartridges from Jaques Herbin inks a little bit ago, just cracked the box and the first cartridge I pulled out was purple! I didn't expect that, and the rest of the cartridges appear to be the green I ordered. I have to wonder how often that happens.
I do, and I found out what happened is a cartridge of Violet Boréal got into my box of Vert Amazone. So I'm going to be getting some of that color next time. :)