This is a really lovely dark green that lives up to its name (the seaweed part, at least). It shades well and dries quickly.
Here I am doodling the Inkling. (I didn’t have much of the sample left so it was difficult dipping the pen into it to write its name.)
Many thanks to Chris Stafford for sending me this sample! I really love this colour.
You can find some more reviews of Montblanc Jonathan Swift Seaweed Green ink on Pennaquod.