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Apr 15, 2020 at 22:09 comment added blacksmith37 Your reference is wrong! Is is NOT foil , it is a vapor deposit .
Apr 15, 2020 at 6:13 comment added THelper Here they say it's between 4 µm and 150 µm, so that would be a factor 40-1500 thicker but I agree with your point that's very difficult to make this profitable.
Apr 14, 2020 at 15:17 history answered blacksmith37 CC BY-SA 4.0