Waterman 50 ml Bottled Liquid Fountain Pen Ink, Serenity Blue (S0110720) (2-Pack) Bottled ink for all WATERMAN Fountain Pens. Liquid ink produces an intense line in brilliant colors. Like the tranquil echo of a dream, Serenity Blue brings peacefulness to the page, ready to awaken pleasant thoughts. The ritual of filling ink from a bottle enhances the noble experience of using classic fountain pens