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Platinum's Pigment inks have improved water resisting, light stability, and heat resisting properties. These properties make them suitable for archival uses.
Pigment inks are safe to use with fountain pens, but you should clean your pen thoroughly every 3-4 weeks to avoid clogging.
Platinum's Classic ink line is created using traditional iron gall formulas. While modern iron gall inks are gentler than their vintage counterparts it is still recommended that you clean out your pens every 3-4 weeks just to be safe.
As these fascinating inks dry, the iron oxidizes, darkening the ink into an off-black color right before your eyes.
Platinum Mixable Ink has been specially formulated to allow you to mix your own colors. You can follow Platinum's ink chart "recipes" or you can experiment with custom color combinations.
This blue-black iron gall ink is fairly waterproof and has good archival qualities, but it is also more acidic than normal fountain pen inks. These cartridges are safe to use in any fountain pen, but it is recommended you clean your fountain pen regularly (every 4 weeks or so) to avoid corrosion, especially in pens with steel nibs.
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