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Also very interesting musicfan... I will be travelling internationally by air again very soon via Europe to Canada and will be keeping an eye out for purple, but I would bet that I am currently the only person on the African continent wearing one! :-) Incidentally, I had give some to a colleague once, who also seemed more interested in them because they were purple and wanted to wear in church for lent (apparently purple is associated with that religious observance) than the extra protection the mask offered...
Geneva, July 4 -- Zentek Ltd has submitted a patent application for graphene oxide-cationic silver nanocomposites and their use as broad-spectrum antimicrobial agents. Haddadi Seyyedarash, Van Der Kuur Colin, Korkis Joseph and Sridhar Deepak developed the invention.