About Platinum Ink Cartridges 2 Pack - Various Colours Pack of 2 Platinum ink cartridges suitable for all Platinum fountain pens. Please note the following with respect to the blue/black colour which is an iron gall ink: Leaving Iron Gall ink in your fountain pen for a long period of time can cause corrosion to occur, particularly with stainless steel nibs. Furthermore, if it is allowed to dry out, solid particles may cause blockages in the feed system that can be extremely difficult to remove. Iron Gall inks should be stored in a cool and dark place to protect them from the negative effects of light on their stability. However, when used correctly, iron gall inks provide very satisfying results as they often quickly change colour once applied to paper, usually transforming to a darker hue than the original. They do not fade and are semi water-resistant and when used regularly, your fountain pen will not require any special maintenance over and above periodic flushing with cold water or a proprietary fountain pen cleaning solution.
