Robert Oster Purple Jazz is not an ink I'd heard mentioned before, so of course I had to find it. After doing some research I found out it used to be named Purple Soul, and has been renamed Purple Jazz. I purchased my sample of ink from Vanness Pens.
Purple Jazz is a dark blue-violet. It's not quite blue, but it's not quite violet either-it rides the no man's land in-between.
In large swabs it looks more violet than it does in writing. There is just a hint of red around the edges.
Let's take a look at how the ink behaves on fountain pen friendly papers: Rhodia, Tomoe River, and Leuchtturm.
Dry time: 40 seconds
Water resistance: Low
Show through: Medium
On 20 pound copy paper the ink performed well, no issues that I noticed.
I used a broad Pilot Vanishing Point Raden Galaxy on Tomoe River paper. The ink had an average flow.
Overall, it has some really interesting shading. It's right in-between blue and violet, which is an unusual color. It is pretty well behaved, but the dry time is a bit longer than most Robert Oster inks.
Disclaimer: I purchased this ink myself, and all photos and opinions are my own. There are no affiliate links on this page.