Prussian blue has an interesting story. The color was first synthesized by accident by Johann Jacob Diesbach in 1776 after using blood-tainted potash with red cochineal dye. This created iron ferrocyanide, which has a very distinct blue color. It later on became the color of the Prussian army’s uniform until World War I. 

The process of creating true Prussian blue has evolved, but it still remains to be one of the hardest pigments to make. The color has only been recently introduced to the Custom Urushi line with the Pilot Custom Urushi Prussian Blue, which required the pigment to be carefully mixed with Japanese lacquer in order to achieve a beautiful finish. It features a #30 18-karat gold nib and gold-plated trims. 

We have for sale a brand new Pilot Custom Urushi Prussian Blue with an FM nib. It comes complete with its box and papers. 

Length capped: 15.4 cm. 
Length uncapped: 14.02 cm.