While mowing my lawn recently, I observed a sudden puff of black fibers come out from under the mower.
At first I thought I ran over someone's black Covid-19 face mask.
What was this?
I checked the debris. The fibers stained my hand a light shade of black. I then found part of a shattered tube from a Sharpie Pen.
I never knew a Sharpie pen had fibers inside.