Ballpoint pens can develop bits of clogged ink in the tip of the ink cartridge causing the pen to stop writing.
Ink cleaning pens.
Be extremely careful when taking the nib section apart and do not try to force the nib out if it feels stuck.
With some fountain pens the nib section can be further disassembled allowing an even more thorough cleaning.
Next time a leaky pen leaves your hands full of ink reach for a can of shortening.
This is particularly useful when the pen has been filled with a high maintenance ink like glitter iron gall or pigment based inks.
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If you find a batch of old pens that are full of ink but will not write the pens may be clogged.
Ballpoint pens that have been stored and unused for long periods are more susceptible to clogging problems than those that are used daily.
In order to clean the converter dump out the excess ink then flush it out with cool running water and let it dry overnight.