Assertion: ballpoint pen's ink | /r/HasProperty | thin
Facets:
Source sentences:
text: Ballpoint ink is closely controlled, as the slightest change would result in a pen that doesn’t work; the ink must be thin enough to dry quickly on release from the pen, yet thick enough to flow smoothly through the pen.
text: The writing experience is seamless, and the ink that comes out is neither too thin, nor too thick.