Sailor Colors of Four Seasons Summer Rikyu-Cha Ink Bottle. Offer your words a beautiful color with the new Sailor Colors of Four Seasons Summer Rikyu-Cha Ink. The color is a perfect amalgamation of brown and green, and when written with it adds a vivid subtlety to your words. The Sailor Rikyu-Chan ink comes in a beautiful 20ml glass bottle.