Endless LABS.16 Alchemy Fountain Pen Inks - Billy's Folly - 45 MLMost enchanting inks ever Billy tumbled out of the box into the lab blinking once, deciding this was probably fine. Our ink is formulated to be gentle on nibs, preserving the delicate components of your fountain pen and extending its lifespan. Suitable for Fountain Pens, & Dip Pens. Periodically flush your fountain pen with clean water to remove residual ink.