It's purple week! We are starting off with Robert Oster Purple Rock. I purchased my sample of ink from Vanness Pens.
Purple Rock is one of those inks that looks a little bit different on every paper. On the Col-o-ring it looks more medium purple.
In large swabs the ink turns looks more of a dusky blue purple. There's just a little bit of pinkish red sheen on the edges. The sheen is not visible in writing.
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 Pelikan M805 Ocean Swirl on Tomoe River paper. The ink had an average flow.
Overall, this ink really does look different on every paper. On the Col-o-ring it's more purple, and on most other papers it's more blue-violet. It has some lovely shading and behaves pretty well. Give it a try, you might love it.
Disclaimer: I purchased this ink myself, and all photos and opinions are my own. There are no affiliate links on this page.