Ask someone to write you a note on some absorbent paper using one of the felt-tip pens you intend to test (don't let them tell you which one). Ensure that the note contains an inky dot ...

After using his beloved Paper Mate Flair felt-tipped pens for more than 30 years ... We’ve set up a tip line at 212-556-1314. You can leave a voicemail there if you have any knowledge on ...