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Message:: [QUOTE="kardinalisimo, post: 49668, member: 118"]As a general rule for older jar you don't want the inside of the foot rim to be slanted outwards but straight. Could be straight or oblique on the outside. Of course, some jars could have flat bottoms with no foot rim.I can't tell from the pictures what's the foot on this jar, slanted or not.But that alone does not mean that the piece is old. You have to look at all the indicators because fakes are all over.Antique porcelain will always show some signs of usage like scratches, marks etc. Unless it was an Imperil piece or was in collection for a long time. The glaze will also have some kind of flaws, more or less. Thickness of the foot, rounded or not, shaved etc, that also matters.Most of the time the unglazed foot will be buff color, kind of orange because of the glaze's iron oxide bleeding.For jars, during Ming, necks were glazed, during early Qing unglazed(the whole piece was glazed and then the neck shaved), Late Qing and Republic will have glazed necks again. The footrim also depends on the type of vessel, size etc. And there are always exeptions. For plates and chargers the Early Qing pieces will have footrims either straight on both sides or oblique on the outside and straight on the inside. Later ones most likely will be straight on both sides.Decoration is also important. But I don't guarantee that all of the above is on 100% true.[/QUOTE]