Kyo No Oto (which translates to “sounds of Kyoto”) fountain pen inks are a collection of ink colors that were created in order to reproduce the traditional Japanese colors of the Heian period.
Shogyo-mujo is the Japanese word to describe the transience of all phenomena. Many things, especially in nature, are beautiful while also being impermanent. These two colors, Yurushiiro and Seiheki, seek to capture such momentary colors in which the hue of the ink changes at the beginning and end of writing.
Seiheki is a muted blue-green that resembles the daytime sky. Sei means "blue" and heki is often used to describe deep blue-green tones (such as of the sky or ocean).