Bottled Fountain Pen Ink provides an economical ink supply for compatible fountain pens fitted with converters, refillable reservoirs or traditional filling mechanisms. It is suitable for everyday writing, signatures, correspondence, handwriting lessons and selected calligraphy applications. Gaslo currently offers a 60 ml fountain-pen ink, while Quill offers royal-blue fountain ink in 35 ml and 90 ml options. Typical specifications: 35–90 ml depending on brand, screw-cap bottle, water-based fountain-pen formulation and colour options commonly including royal blue, black and other selected shades.