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I know this discussion is a few years old now but I only just noticed it. I've noticed bottles with the covering (not sure what to call it) in a painting of Hogarth's Midnight Modern Conversation, of which there are various versions of. Here's one that shows them bottom left and top right.http://www.thesundaytimes.co.uk/sto/multimedia/dynamic/00372/STL2935HOGARTH_372217k.jpgI think it was in a book about Hogarth by Lars Tharp or maybe it was about ceramics and Hogarth was mentioned. I'll see if I still have it.