What does black blotting paper in the stomach indicate after acid poisoning?

The presence of black blotting paper-like changes in the stomach after acid poisoning specifically indicates the ingestion of sulfuric acid (H2SO4). This is primarily due to the severe corrosive effects of sulfuric acid on biological tissues, which leads to the formation of a black, necrotic mass resembling blotting paper.

Sulfuric acid causes significant damage to the mucosal lining of the stomach, resulting in coagulation necrosis, which is evident in post-mortem examinations. The tissue damage is characterized by a deep black coloration, which results from the carbonization of organic material in the tissues. This distinctive appearance is not typical with other acids listed in the options, making sulfuric acid the most appropriate answer.

Hydrochloric acid (HCl) generally poses a risk for serious injuries and can create ulcerations but does not produce the characteristic black, necrotic effect associated with sulfuric acid. Nitric acid (HNO3) can also cause corrosion and necrosis but typically results in yellowish or brownish discoloration rather than black. Carbonic acid is a weak acid with minimal corrosive properties, making it unlikely to produce such severe and distinctive changes in gastric tissue.

Thus, the formation of black blot