Yamabuki is a yellow ink in Sailor's Manyo series. This evenly flowing and water-based ink comes in a 50 ml bottle and fits all types of fountain pens. Also available in several other colors.
Sailor's Manyo series is inspired by flowers that are mentioned in various ways in the dictationology Man'yōshū, written in the Japanese poem form waka and published as early as 759. Man'yōshū consists of over 4,500 poems written by the same number of people from all social classes.