Endless Alchemy Fountain Pen Inks - Obsidian Sky - 45 MLMost enchanting inks ever The alchemist bottled the void pure black drawn from the sky's deepest silence. 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.