Bought this used pigment from a local art store, and it was labeled Viridian, which it clearly isn’t (All the other pigments I have from this collection seem to be properly labeled), so I want to see if anyone has any ideas for what it could be.

It was quick to mull into a fairly consistent paint, although it definitely could have used longer. I didn’t write it down, but I think  it was a 1:1 binder to pigment ratio, using honey and clove oil as the humectant and preservative. it doesn’t rewet readily, with the water sitting on top of the pan for a while.

When painting it has a gummy consistency, reminiscent of terre verte, although I found it easier to work with. It seems to be semi-transparent to semi-opaque, although as it dried it seemed to fade the sharpie marks, which was weird (I may not have let the sharpie dry long enough). It doesn’t readily stain, but leaves behind a bit of color when lifted.

my initial thought was that it was a mixture, because I’ve never seen a modern pigment with this color, but there were only single pigments in the collection, and it was from the 70s I believe, so it could be a historic pigment.

Any ideas? Let me know if there’s other tests/info that would be useful.

Need help identifying a bright green pigment