Which substance is both carcinogenic and flammable?

Collodion is a highly flammable substance that is used in various applications, including as a medical dressing for wounds. In addition to its flammable properties, collodion also contains nitrocellulose, a compound that is classified as a carcinogen due to its potential to induce cancer. This dual characteristic of being both carcinogenic and flammable distinguishes collodion from the other substances listed.

Alcohol, commonly used in various applications including as an antiseptic and solvent, is flammable but is not classified as a carcinogen in most contexts. Glutaraldehyde is known for its carcinogenic properties but is not typically considered flammable. Bleach (sodium hypochlorite) does have some hazardous properties but is neither classified as carcinogenic nor primarily identified for its flammability.

Therefore, the selection of collodion highlights its significant health and safety concerns due to the combined risks of carcinogenicity and flammability, making it a noteworthy substance in clinical and laboratory settings.