Can the black substance inside scallop meat be eaten?
The black substance commonly found in mussels is usually internal organs or excretory material. It can be consumed in small amounts if the mussel is fresh and has no unpleasant odor; however, it should not be eaten if spoiled or abnormal. If in doubt, it is recommended to seek medical advice beforehand. Detailed analysis is as follows:

The black portion in mussels mostly consists of digestive glands, visceral masses, or unexpelled metabolic waste, which are normal physiological components. If the mussel is fresh and plump, with a firm texture and no foul or fishy smell, the black part may be safely consumed in small quantities after being thoroughly cooked, without posing any health risks.
However, if the mussel is not fresh and the black portion appears slimy, greenish, or emits a strong unpleasant odor, or if the flesh is decaying or sticky, this may indicate bacterial growth or the presence of harmful substances. In such cases, the mussel should not be consumed, as it could easily cause gastrointestinal discomfort.
Before eating mussels, carefully select live, fresh specimens, clean them thoroughly, and ensure they are fully cooked. Whether or not to consume the black portion should depend on its freshness. If symptoms such as abdominal pain or diarrhea occur after consumption, stop eating immediately and seek medical attention.