GourmetPens - Four purple-ish swabs: Sailor Studio 123, Sailor Manyo Nekoyanagi, Vinta Inks Maskara, and Sailor Studio 150. I don't know which one is my favorite so naturally, I have them all.
Ink Overview: Sailor Manyo Series I Part 2 (Nekoyanagi, Sumire, Yamabuki and Yomogi) — Macchiato Man
Sailor Manyo Nekoyanagi: Fountain Pen Ink Review - The Goulet Pen Company