Platinum Carbon Black Cartridges

Set of 4 Carbon Black fountain pen ink cartridges to fit Platinum pens.  Platinum Carbon Black is waterproof and lightfast and thus requires more maintenance in your pen.  It is ideal for projects where watercolors or other media will be used over the ink. Note:  Platinum Carbon Black is not recommended for use in flex pens as it will railroad far more readily than other inks.  It is also important to regularly clean your pen and not allow the ink to dry out when using this ink.  To increase flow consider using one drop of our FPR Railroad X Ink Lubricating Additive in 10ml of Platinum Carbon Black.