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A fountain pen was accidentally filled with china ink. When it dried out, it was completely clogged. Water alone doesn't help and ultrasonic cleaner bath doesn't seem to change anything.

Is there some mild chemical which can be soaked into the pen and solve the ink to ease the cleaning with the ultrasonic cleaner bath?

Or what other means do I have besides paying an expensive repair service?

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China [aka india] ink contains carbon and varnish [or perhaps shellac] to produce a distinctive long-lasting black coat which when dry is waterproof.

No amount of water will dissolve the hardened ink residue.

Shellac is easier to remove than varnish so test the pen first with denatured alcohol. If the ink liquefies, it contains shellac; if it gets soft but doesn't dissolve, it contains a mixture of shellac and lacquer. Test the pen again with lacquer thinner; if it liquefies, it's lacquer. Shellac can be removed with denatured alcohol, lacquer with lacquer thinner, and a shellac-lacquer combination with a 50-50 mixture of denatured alcohol and lacquer thinner.

If the ink contained varnish (which is most likely), you will need something to dissolve the varnish such as varnish remover. Let the parts soak in a solution in a glass jar. If you have access to an ultrasonic vibrator, put the whole jar into the water bath to increase varnish remover efficiency. Check it after several minutes to see how it's going. If the liquid in the jar starts to turn black, it's working.

Good luck.

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  • Ok, tried it with alcohol, had it moved inside the ultrasonic vibrator for numerous times. While there were some flakes of china ink loosened from the pen, it did not dissolve. After a lot of tries (days) in alcohol I added little but strong solvent (orange oil) to the alcohol. It loosened some more flakes but did not dissolve the ink either. In the end the plastic parts of the tip started to dissolve but not the ink. I think I end up replacing the whole tip and ink conducting parts now. – Ariser - reinstate Monica May 13 at 14:56
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Get some technical pen cleaner from your local hobby shop... Rapidoeze, I found some guy recommends this, he used it on old fountain pens from the 70's.

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It is quite likely only the nib which has become clogged.

Just buy a new nib. It is quite easy to remove and refit - although you'll get inky fingers!

Some of them pull out and some unscrew.

Here is a video showing how to change one type.

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