keystone - down bubble

Down Bubble is a versatile teal ink from Birmingham Pen Co.'s Keystone Formula line, crafted with water-soluble dyes for traditional performance, easy cleaning, and excellent blending with other inks to create custom shades. It's known for its stability, consistency through a meticulous multi-step production process, and value with 60mL providing about 75 converter refills. This ink suits everyday writers and enthusiasts who enjoy mixing colors for personalized hues.