While J.C. and K.C. and I were climbing on the east side of the Sierra, I used my "50 meter" rope. Its length is placed in quotes because the rope started life as a 60 meter, bi-color cord, but I cut off about 30 feet several months ago due to a core shot.
When we started this trip, this fairly used rope was 50 meters long, and not bi-color. Its center point was marked in bright red (done using a Sharpie marker).
And damn if the same rope didn't get another core shot on this trip! We don't know how, but clearly that part of the rope wasn't usable; white was visible under a tattered inch-long part of the sheath. "Oh well," I assumed. Maybe if I cut it it would make a nice "short rope" to use on "short crag" days.
I just cut it down again. Now I've got a 145 foot rope. Usable, just like J.C. uses his half-length ropes to cut down on weight on some days. And the center point? How convenient. The rope's center point is, once again, where the bi colors meet