Private Reserve fountain pen ink is renowned for its vivid colours and excellent flow characteristics. Private Reserve inks now come in 66ml bottles, therefore offering better value. All colours are pH neutral, fast-drying and suitable for all makes of fountain pen. Please note that we recommend caution when using Private Reserve ink in vintage pens (especially ones made from casien) due to the possibility of staining of the barrel or cap. Also, Private Reserve inks have a higher dye concentration than most other brands to give their vivid colours. This means that you should make sure you clean your pen a little more frequently than you would normally do to avoid clogging due to dried ink deposits.