Researchers at Membrion in Seattle are working on an electrically charged spray to improve the ability of cloth masks to filter out coronavirus-containing droplets and aerosols. Here, blue dye has been sprayed on treated and untreated cotton. The color fades on the treated fabric, showing that the positively charged coating neutralizes the negatively charged dye in an approximation of the way the coating captures negatively charged coronavirus particles.  (Ken Lambert / The Seattle Times)
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