The Parker Quink 57ml black blue ink cartridge is the essential classic ink bottle for refilling fountain pens with converters. Containing 57ml of Quink's exclusive formula ink with lubricating particles, this glass bottle from Parker ensures a constant flow and protects the internal mechanism against clogging. The black blue shade provides an elegant and distinctive line on paper. It's the perfect choice for calligraphy enthusiasts, diaries, and formal signatures.