Researchers in Japan are working on masks that glow if they detect the coronavirus.
The masks glow under ultraviolet light if they come into contact with the virus.
The team has been using ostrich eggs to work on developing the masks.
If the coronavirus is present, this will cause the filter to glow under ultraviolet light.
In a small study of 32 people who all had coronavirus, all of their masks glowed under ultraviolet light.