PLATINUM DYE INK CARTRIDGE
The platinum ink cartridge type dyestuff ink for fountain pen and marking pen. Platinum Dyestuff ink is High-quality ink. A stainless steel ball holds the ink from coming out until the cartridge is pushed into the back of the gripping section of your fountain pen. This serves a second purpose which helps meter the ink flow when the cartridge is opened and allows for priming when the pen is shaken.