Allegro brand stannic chloride smoke tubes during fit test of N95 mask, San Ramon, California, April 17, 2020. N95 masks are commonly used in the treatment of COVID-19 coronavirus by medical professionals, and are often fit tested before use with infectious patients. Stannic chloride is typically used for N100 masks, but is shown here for illustrative purposes. ()

- Image ID: 2BH36A9
Allegro brand stannic chloride smoke tubes during fit test of N95 mask, San Ramon, California, April 17, 2020. N95 masks are commonly used in the treatment of COVID-19 coronavirus by medical professionals, and are often fit tested before use with infectious patients. Stannic chloride is typically used for N100 masks, but is shown here for illustrative purposes. () Stock Photo
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Allegro brand stannic chloride smoke tubes during fit test of N95 mask, San Ramon, California, April 17, 2020. N95 masks are commonly used in the treatment of COVID-19 coronavirus by medical professionals, and are often fit tested before use with infectious patients. Stannic chloride is typically used for N100 masks, but is shown here for illustrative purposes. ()
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Image ID: 2BH36A9
Allegro brand stannic chloride smoke tubes during fit test of N95 mask, San Ramon, California, April 17, 2020. N95 masks are commonly used in the treatment of COVID-19 coronavirus by medical professionals, and are often fit tested before use with infectious patients. Stannic chloride is typically used for N100 masks, but is shown here for illustrative purposes. ()
Location: United States