Let's talk about Robert Oster Australian Opal Mauve. The name is a bit long, but that's ok. I purchased my sample of ink from Vanness Pens.
Australian Opal Mauve is a light, dusky purple with a blue undertone.
In large swabs, you can see the bands of blue undertone.
Dry time: 25 seconds
Water resistance: Low
Show through: Medium
On 32 pound copy paper, the ink behaves a little bit differently: it doesn't bleed or feather, but the color looks a bit darker, and the blue undertone becomes more prominent. In the flex nib, you can see three different bands of color.
This close-up shows the different shades that show up on copy paper in the flex nib. It starts with a light dusky purple at the top, then the band of blue, then the darker purple.
I used a Pelikan m800 Renaissance Brown, medium nib, on Tomoe River paper. The ink/pen combo felt just a bit dry to me.
Overall, I like this ink the best on Tomoe River paper, where you get the best shading. I would probably use this ink in the spring.
Disclaimer: I purchased this ink myself, and all photos and opinions are my own. There are no affiliate links on this page.