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It is often accepted a priori that a face mask worn by an infected subject iseffective to avoid the spreading of a respiratory disease, while a healthyperson is not necessarily well protected when wearing the mask. Using a frugalstain technique, we quantify the ballistic droplets reaching a receptor from ajet-emitting source which mimics a coughing, sneezing or talking human: in reallife, such droplets may host active SARS-CoV-2 virus able to replicate in thenasopharynx. We demonstrate that materials often used in home-made face masksblock most of the droplets. We also show quantitatively that less liquidcarried by ballistic droplets reaches a receptor when a blocking material isdeployed near the source than when located near the receptor, which supportsthe paradigm that your face mask does protect you, but protects others evenbetter than you.

Protecting others vs. protecting yourself against ballistic droplets: Quantification by stain patterns