What is “running clear” actually?

I’ve struggled with severe constipation that isn’t pelvic floor dysfunction for years and have been on Motegrity with success until recently. Long story short it had been over a week with zero bowel movement even with an enema, so I went to the ER.

They confirmed I was just hella constipated and no bowel obstruction (like I had 10 years ago), and I was instructed to take magnesium citrate until my poop “runs clear”. Usually I have experienced this with colonoscopy prep, but after a bottle and a half of mag citrate where a majority was dark liquid I’ve arrived at no “clear” liquid, only small amounts of grainy black poop.

Is this still considered clear? My butthole thanks you in advance.