Also to change them (and/or wash your hands) if you touch your face anyway, or forget and sneeze/cough into your hands, etc. They're often brightly colored to r

Also to change them (and/or wash your hands) if you touch your face anyway, or forget and sneeze/cough into your hands, etc. They're often brightly colored to reinforce this "reminder" function. They certainly don't have to be. Pretty sure their natural color would be off-white or grey.