Rohrer & Klingner bottled fountain pen ink - Blu Mare (50mL) Writing inks are suitable for all fountain pens, quill pens and calligraphy utensils Rohrer & Klingner fountain pen inks are made following well established recipes using specially treated water, natural ingrediants and brilliant colorants 50 ml bottle (about 1.7 fluid ounces) Well-balanced composition makes for optimal ink flow Made in Germany