A cossack adjusts the SilverMask reusable face mask while patrolling the streets in Kaliningrad, Russia April 1, 2020. Scientists from the Immanuel Kant Baltic Federal University designed reusable face masks with multilayer structure which includes layers with the deposition of silver ions that they say have antibacterial and antiviral properties and give better protection against the coronavirus disease (COVID-19). Picture taken April 1, 2020. REUTERS/Vitaly Nevar
MOSCOW (Reuters) - Cossacks and police officers enforcing the coronavirus lockdown in Russia's western city of Kaliningrad have donned modified face masks that local scientists say can be worn for days without being replaced.
The trick, they say, is to line the cheap cotton fabric of the masks with an ultra-thin coating of silver.
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