What a great tip! Thank you very much.

Benn there, done that, in high school.

I had two old boxes of 50 Biro's I thought I would have to throw away, your tip worked well (so far) putting tip in spout of kettle and brought to boil.Thanks

Heating the ink certainly works in the short term. Unfortunately it also evaporates some more of the alcohol that allows the ink to flow. What I do is put a couple of drops of methyl alcohol in the ink tube, stand it tip down for a couple of weeks, and your set for more years of good writing.

It's a great way to ruin a pen alltogether.

I tried but it didn't.