These are becoming one of the most in-demand commodities in the COVID world with malls, offices, banks, and shops lining up to install the structure at their entrances. The company swamped with these orders is a relatively new one, Chennai-based Nanolife, which has patented its Rajat Bhasma formula or the silver nanoparticles solution as a healthy disinfectant. Sceptics, however, say if a person is potentially exposed to the COVID-19 virus, spraying the external part of the body would not kill the microbe, which is inside the body.