Pilot Iroshizuku Ku-jaku (Peacock Blue) Ink black ink it swaps cartridges for a

it swaps cartridges for a built-in piston filling system—simple

and even a small writing kit

which will continue to darken with time as the chemical reaction between the ink and the paper continues

and ready for your favorite inks

Pilot Iroshizuku Ku-jaku (Peacock Blue) Ink black ink it swaps cartridges for aIroshizuku Ku jaku (Peacock) is a teal blue fountain pen ink. The official Pilot swatch reads much more blue the real color has much more green. Pilot's Iroshizuku line of fountain pen inks are the gold standard for a reason. They're well behaved, wet writing, generally quick drying (<20 seconds), and come in an assortment of stunning colors. Because of how Iroshizuku inks tend to be, they can often be some of the most reliable inks to give you a