Am about to jump on a plane. Just some anecdotal experience to report. With regards to the imprint. My experience is that it is removable by using a jeweller's rouge (ala ~6000-10000 grit equivalent). I haven't been able to remove it using something that's completely non-abrasive. I believe myv65/Dave is correct about the ridged edges, but the issue here is that of size. To take just a jeweller's rouge to remove the imprint in the space of seconds, we're talking some extremely small imprints going on here (sub-micron's?)
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