Hi, Terry and Jason, Thanks for the comments on nanosilver, Terry, and the comments on the coinage of EIS, Jason.
On reflection, I suppose my preference for EIS is based also on my preference for macroscopic operationalism in the style of P.W. Bridgmann. Thomas Graham gave an operational definition to colloids based on their inability to penetrate vegetable parchment. Professional scientists give an operational meaning to nanoparticles based on advanced microscopy not ordinarily available to layman who make their own EIS/CS/NanoSilver. Layman ordinarily have only laser pointers, conductivity meters, volt-ohm-milliammeters, their own natural senses of taste and sight, but rarely any other apparatus. It would be a lot easier to use vegetable parchment on Graham bottles (inverted glass bottles with bottoms removed) than to get a grip on dark-field microscopes. But most of us do not even bother making our own Graham bottles. I have no objection to using CS or nanosilver when the occasion and the audience demand it. But I still vote for EIS because it suits the actual laboratory apparatus that laymen actually use. Best regards, Matthew
