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When using this ink, we recommend giving your pen a good cleaning every 4 to 6 weeks, or if you don't plan on using the pen for a week or longer. This ink contains pigment particles, which can cause clogging if allowed to dry out inside of a pen.
Platinum Carbon Black Ink - 60 ml Bottle | JetPens Platinum Carbon Black Ink - 60 ml Bottle | JetPens
It is a good idea to clean your pen every week to prevent the ink drying and clogging the nib and feed. For best results, use it with an absorbent paper and allow it to dry for 24 hours before exposing the ink to water. Water-resistant pens and inks may smear or discolor when exposed to water but will remain legible under most circumstances. Please note: Pigmented inks are suitable for use in fountain pens, however, they require a little more care and attention and should not be left to dry out in a pen.