I use my fountain pens at work daily. I've had too many encounters with spills and drips on my notes to make me wary of what ink I use. One event, in particular, stands out for me when I wrote something down on a piece of paper for someone to refer to. Later, I saw the note on his desk. He had dripped some water on it, and the ink had run all over the place, not even legible! Embarrassing. It's one thing to be retro and insist on using my fountain pens at the office, but it's another when it affects the quality of the work product. So, I've been on a quest to find inks I can use reliably for work and not worry about accidents happening to destroy the writing.
I have quite a lot of inks in my collection. with even more samples. I selected some inks that I've been using lately along with a couple I like, but have had bad experiences with their lack of water resistance. I use a lot of Black n' Red notebooks at the office, along with copy paper. I also wanted to compare performance with a premium paper, so I selected Rhodia.
The tests consisted of generating a baseline for the three papers and 18 inks. I scanned the images at 600 dpi into jpeg files. They were later down-converted to lower quality jpeg to come in under 1 MB file size. I cut each sheet into two pieces - a control and a test side. After each test, they were scanned with the control and the test side together to provide a good comparison. The first test consisted of pouring a stream of water over the paper for a few seconds and then allowing the paper to dry without touching it. This simulated a spill at work and represents my biggest concern. The second test was for permanence. It was an 8 hour soaking in a water bath with some agitation to slough off any loose ink to see what actually remained behind on the paper. I'm posting the two test results and not the original because each test has its own control side to compare with.
There are several ink brands that make water resistant inks. I've posted scans of some others previously (including Platinum). These are the inks I've been using lately as I've narrowed my preferences. One factor I've been looking for is quick drying inks so I can write and quickly turn a page without it transferring to the contacting sheet. A lot of permanent inks tend to dry slowing. The fastest drying permanent inks I've found are the DeAtramentis Document series of inks. The negative to these are that they soak in fast and feather a lot on cheaper paper. It's always a trade-off between dry time, permanence, saturation, and smearing. That's why I have so many inks. No one ink solves all problems.
If I had to pick one ink to use exclusively, it would be Noodler's 54th Massachusetts. It drys relatively quickly, doesn't smear after a few minutes drying, and is really permanent with no wash off in spills. It's also a nice blue-black color. A close runner-up is Pilot Black. Dries really fast, well-behaved in all pens, and after a light wash off, leaves behind a very permanent residue.
Papers tested: 24 lb Black n' Red, Rhodia 80 gsm dot pad, Xerox 24 lb copy
DeAtramentis Document Black
Diamine Majestic Blue
Faber Castell Moss Green
Pilot Blue Black
Noodler's General of the Armies
Noodler's Liberty's Elysium
Noodler's #41 Brown
Noodler's 54th Massachusetts
Noodler's Bad Blue Heron
Noodler's Heart of Darkness
Noodler's Bad Belted Kingfisher
Noodler's Upper Ganges Blue
Noodler's King Te cheng