We recommend this carbon ink especially to the heavy users who love to write and write. The more you write, the better its performance will be. This ink may still smear or bleed on certain papers when exposed to a lot of water. For best results, use it with an absorbent paper and allow it to dry for 24 hours before exposing the ink to water. If you do not use the fountain pen in carbon ink for more than one week, please pull out the ink and wash the ink converter thoroughly. Platinum's famous permanent waterproof ink. Platinum Carbon Ink is pigmented ink suitable for fountain pens - for documents, drawings (including line and wash) and general-purpose use. However, this ink does have the potential to damage pens if not used according to instructions. This ink can dry and clog fountain pen feeds if left too long as it contains ultra-fine carbon particles. It is only suitable for pens that are in daily use and if the pen is to be left more than a couple of days without use then we advise flushing the pen and converter. This ink contains pigment particles, which can cause clogging if allowed to dry out inside of a pen. 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.

Platinum Carbon Ink Bottle - Cult Pens Platinum Carbon Ink Bottle - Cult Pens

Waterproof pens and inks exhibit little or no smearing or discoloration when exposed to water. Water-resistant pens and inks may smear or discolor when exposed to water but will remain legible under most circumstances. Water resistance can vary depending on the paper used and how long the ink has had to dry. It causes serious problem because it is not easy to clean the pen clogged with the ink and dried up. 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. It is a good idea to clean your pen every week to prevent the ink drying and clogging the nib and feed. Comparing to the ink water-based with dyes, it tends to be stopped up because particles are coarse. If you use your fountain pen with the carbon ink everyday, there may not come problems but in case you have long period to use the fountain pen, it will be clogged.

That is why the carbon ink is suitable for important documents such as official documents which need to be stored for a long time. Some people use the carbon ink to draw a rough design for a picture painted in watercolors or colored inks because carbon ink is run-proof.

Platinum Carbon Black Ink - 60 ml Bottle | JetPens Platinum Carbon Black Ink - 60 ml Bottle | JetPens

The following is copied directly from Platinum and contains important information about using this ink.