Ink Review #860: Robert Oster Cosmic Swirl


I’m still hooked on some new Robert Oster inks-today’s ink is Robert Oster Cosmic Swirl. Thanks to Vanness Pens for providing this ink for review.


The color:

Cosmic Swirl is a light, gorgeous purple with a slight warm tone on the Col-o-ring paper.



In large swabs on Tomoe River paper the ink looks a little cooler in tone-more blue. There’s just a hint of gold sheen.


Writing samples:

Let's take a look at how the ink behaves on fountain pen friendly papers: Rhodia, Tomoe River, and Leuchtturm.

Dry time: 20 seconds

Water resistance: Low

Feathering: Low-there was some feathering in the flex nib.

Show through: Medium

Bleeding: Low-there was some bleeding in the flex nib.

Other properties: medium shading, tiny sheen, and no shimmer. The sheen is only visible in large swabs on Tomoe River paper.

On Staples 24 lb copy paper the ink feathered in all nib sizes and had a little bit of bleeding.

Comparison Swabs:


Cosmic Swirl is a little warmer in tone than Pilot Iroshizuku Jurojin, but a little cooler than Pilot Iroshizuku Murasaki-shikibu. Click here to see the Robert Oster inks together, and click here to see the purple inks together.

Longer Writing:


I used a Platinum 3776 Nice Lavande with a broad nib on Tomoe River paper. The ink had an average flow.

Overall, I really enjoyed this ink. I did find myself wishing the flow was just a little bit wetter, but that’s just because I prefer wet inks. The color is beautiful and different from the purple inks I already have. I’m glad I have a full bottle because I think it’s an ink I’ll use often.

Disclaimer: This ink was provided by Vanness Pens for the purpose of this review. All photos and opinions are my own. This page does not contain affiliate links, and this post is not sponsored in any way.