The stool color is strange or different. Normal stool colors are any shade of brown, tan, yellow or green. Colors that may be caused by a disease are red, black and white. Dark green may look like black, but dark green is a normal color.
Your child swallowed an unusual but harmless substance. Your doctor told you it was harmless. It was not a solid object that could get caught in the throat or esophagus. It was not a poison, chemical or drug.