The Kaweco Paradise Blue 50ml fountain pen ink refill fills the page with a vibrant and refreshing turquoise hue inspired by tropical waters. Presented in a 50ml glass bottle with a wide base and a tight screw cap, this water-soluble ink offers quick drying and a smooth flow that preserves the fountain pen's feed. It is ideal for use with plunger converters or piston-fill pens. The luminous turquoise blue tone brings joy to personal letters, bullet journals, and creative notes on high-grammage paper.