Lewisite

Lewisite is a chemical compound that was developed as a chemical weapon during World War I. It is a type of blister agent, meaning it can cause painful blisters on the skin and serious damage to the eyes, respiratory system, and internal organs if inhaled or absorbed. Lewisite is odorless in its pure form but can emit a smell reminiscent of geraniums when in a mixture. Its use is banned under the Chemical Weapons Convention, and it is considered a significant hazard due to its potential for harm and persistence in the environment.