I wanted a torture test. I picked the Plumix because it’s an inexpensive pen but it still comes with a good stainless steel nib. Not a fancy nib, but a good, low-price stainless steel nib. The Plumix feed is stingy, which helps make this test harder, because Cassis Black is a moderately dry ink. To make things worse, I decided to leave the pen mostly unused.
I filled an empty ink cartridge with Cassis Black on June 9th. I’ve picked up the Plumix only four times since then, to check it by looking it over and writing a few words. Yesterday was the fourth time, more than a month in. I took a few photos, for an in-progress report.
Here’s the nib — a few drops of Cassis Black have been sitting on the surface of the nib.
But no damage. I brushed away the ink just to be sure.
This nib looks perfect, visually.
Beyond the visual, the pen wrote perfectly as well. Startup was instant. The ink flowed a little lightly at first — see the top line — but flow picked up and was absolutely normal after those first four words.
So, my interim report is perfectly positive. After more than a month in the pen, having been generally neglected, even with nib creep which keeps the ink in extended contact with the surface of the nib, I see no effect on the Pilot stainless steel nib.
You never have to worry about using iron gall inks in gold nib pens, because gold will not react to iron gall. Stainless steel is the question. Stainless steel is generally safe with most acids, but you like to make sure, and I know this concern keeps many people from trying modern iron gall inks.
Actually, here’s a link to a review I did of another, KWZ Iron Gall Aztec Gold, Near the bottom of that page you’ll see a photo of my Lamy Safari stainless steel nib, absolutely unaffected after seven weeks of use with KWZ Iron Gall Aztec Gold.
So it is with Platinum Classic Cassis Black: so far, so good.