Robert Oster Australis Tea Signature Ink

Robert Oster Australis Tea Signature Ink is a fountain pen ink that sits in a soft green family with a slightly muted, earthy tone. It’s made by Robert Oster, known for producing inks with strong color character and smooth everyday performance.

On paper, the color leans toward a green-tea inspired shade with subtle variation depending on the pen and paper you use. It can look lighter and more yellow-green in finer lines, while showing a deeper, more olive green in broader strokes. The ink also has noticeable shading, which gives writing a bit of depth instead of a flat, uniform color.

In use, it generally feels smooth and consistent in fountain pens, with a balanced flow that works well for daily writing. It isn’t overly wet or overly dry, and it behaves reasonably on good-quality paper, making it suitable for notes, journaling, or general writing where you want a natural green tone with some character.