I had my appendix removed a week ago and since then my stools have gone from a black tat like substance to yellow to now only mucus is this normal?

Stool change: It appears that you have significant changes in your bowel movements since the surgery. Irritable bowel syndrome, antibiotic induced diarrhea,post op diet changes are some possible causes. Black stools can occur with upper gi tract bleeding, taking iron supplements or peptobismol. See your physician or a gastroenterologist if symptoms persist and inform them of your black stool history. Test stool