Private Reserve Fountain Pen Inks are among the best inks available today. Any fountain pen enthusiast will tell you the same. It is really hard to buy just one bottle. There are so many bright and vivid colors to choose from at a very modest price. The wide mouth on the bottle makes it easier for refilling your fountain pen. Most of the bottled ink colors are also available in 12-pack disposable cartridges. The "International" or "Universal"-size cartridges fit almost every cartridge/converter fountain pen on the market, including pens made by Aurora, Taccia, Conklin, Laban, Online, Waterman, Parker, Libelle, etc. The 12-pack features a plastic recloseable case that will help preserve the life of the unused cartridges. Please use our product photos as a reference to select your Private Reserve Ink. Note that due to computer imaging and the difficulty in matching true color in natural versus artificial light sources, the ink colors are not exact depictions of the real ink. These swatches are meant to be used as a guide to help you get a general idea of the color differences.