The glass jars come in a variety of shapes and sizes, have
rubber seals, glass lids, and stainless steel clips. Food is processed in Weck jars using the water bath canning technique, not a pressure canner. During the canning process the lids are secured by the clips which can be removed once the processing is complete and the jars have cooled since the lid is being forced shut by atmospheric pressure. A correctly sealed jar is indicated when the tab of the rubber seal points downward. Flip your clips. ==See also==