Canning jar dating
Amphorae were too cheap and plentiful to return to their origin-point and so, when empty, they were broken up at their destination.At a breakage site in Rome, Testaccio, close to the Tiber, the fragments, later wetted with Calcium hydroxide (Calce viva), remained to create a hill now named Monte Testaccio, 45 m (148 ft) high and more than 1 kilometre in circumference.[UPDATE: Verallia plants, as of April 2014, are now under the ARDAGH GROUP].
Stoppers of perishable materials, which have rarely survived, were used to seal the contents.Amphorae are of great use to maritime archaeologists, as they often indicate the age of a shipwreck and the geographic origin of the cargo.They are occasionally so well preserved that the original content is still present, providing information on foodstuffs and mercantile systems.CO” embossed on the bottom, and in general those jars probably date mostly from around 1904 to circa 1920.Other jars made in later years include their “Self Sealing” Mason, which was made in many different types and sizes including the “wide mouth” varieties.
Two principal types of amphorae existed: the neck amphora, in which the neck and body meet at a sharp angle; and the one-piece amphora, in which the neck and body form a continuous curve.