BUT: please don't recommend anything that is Eternal or Bulletproof... basically if soap can't clean it off my hands, I'm not interested (plus I tend to spill a little).
So to sum up, what's a water-proof (or resistant) ink that's a color you would NEVER use at work? Extra points for good shading!
-Miss Inky Fingers-
Jocelyn, Noodler's Bulletproof inks are chemically designed to bond with cellulose fibers over a few hours after first contact with the paper. Since skin is not cellulose, they aren't particularly hard to wash off. Some bulletproof inks wash off skin easier than non-water resistant inks. Each bulletproof ink is different, but none of the "bulletproof" inks are really any different to wash off your hands than other inks. Diamine Oxblood is totally washed off with water, and it is hard for me to get off my skin, maybe a lot harder than any of my bulletproof inks.
Lexington Gray as shown above is one of Brian Goulet's top 7 shading inks. It is totally bulletproof. Not a bright color. Black Swan in Australian Roses is also on Brian's list, however water washes out the lovely colored dyes leaving only the black component behind. Noodler's calls this "partially bulletproof". BSAR would work great for addressing envelopes, as water removes the color but the other dyes in the ink are quite legible.
I got a bottle of Scabiosa and put it in a pen/nib combination that is very wet. It shades very well, but was so dry in that normally wet pen that I got hardly any of the dark, rich color that Tas shows above. In a flex pen I think it would be fantastic. And it is totally waterproof, and dries quickly. I left it in my pen too long and it was a bit hard to clean out. Plus, the underside of the stainless steel nib was lightly etched by contact with the Scabiosa ink. I probably had it in the pen for a couple or three months. Flush it out every week or two and you will be fine.
The water proof ink I would never use at work is Noodler's Rachmaninoff. Very bright and eye catching, more than pink. Highly saturated, viscous. I recommend diluting it with distilled water. And don't leave the cap off your pen very long! Not hard to clean out, but it dries quickly in the nib (and on paper). NO SHADING AT ALL. But, it worked well in my Platinum Cool with a fine nib. I was using it for editing, making comments in the margin, underlining. Get a sample from Goulet Pens before you buy a bottle. You can add a good bit of distilled water without making this ink lighter. I put several drops of water in a Platinum cartridge about 3/4 full of Rachmaninoff, and it did not change how the ink looked on paper.