A customer was recently asking about safety pen leakage. A safety with good seals should be as leakproof as any fountain pen could be. That doesn't mean, however, that it can't leave a mess quite without any leakage. One example is how ink can end up spattering in tiny droplets when the nib is extended if there happens to be a film of ink spanning the barrel opening when the pen is uncapped, like the soap solution across a bubble-blowing wand.
My customer's issue was something a bit different, though. It seems it was a matter of ink sticking to the plug inside the cap. When the cap is tightened the plug is pressed firmly against the barrel mouth, as can be seen in the photos above and below. Yet as the closeup below shows, any ink that ends up sticking to the face of the plug is going to drip into the threads once the cap is removed and set on its side. And from the cap threads it will soon enough end up on the barrel threads and thence on the writer's fingers.
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