I’ve been using a fountain pen for years, but I had never known a fountain-pen-safe waterproof ink — until today. Apparently the folks at the Noodler’s Ink Company have created a few inks that contain cellulose-reactive dyes. No pigment means a happy pen, but waterproof means I can finally use my fountain pen to address envelopes, too. I’ll definitely have to order a couple-few colors and give them a spin.
