Diamine Bottled Inks are available in broad spectrum of over 100 colours in both 30ml and 80ml sizes. Made in the UK with gentle formula which is certainly safe for all brands and types of fountain pens, therefore making them top quality ink. Whether you prefer to use an ink converter, cartridges or the dipping method and calligraphy pens, these inks are of fantastic quality. Diamine Ink Aqua Blue 80ML comes in a 80 Millilitre beautiful glass bottle.