Pilot Iroshizuku Fountain Pen Ink - Tsuki-YoPilot Iroshizuku Fountain Pen Ink Tsuki Yo (moonlit night): A dark blue ink with a subtle teal undertone. Pilot Iroshizuku Tsuki Yo ink is made in Japan and is a dark blue with plenty of shading. Fountain Pen Ink 50 ml bottle Dark blue Use in any fountain pen with a converter Made in Japan Pilot makes exceptional writing instruments to suit all your needs. They offer fountain, ballpoint, retractable, erasable and gel ink pens, whiteboard markers and