Weck jar secured by steel tension clips which can be removed once a vacuum seal has formed. During storage the vertical position of the rubber seal's external tongue indicates the status of the sealing. Weck products are still produced and are available from German hardware and online stores. Used equipment is frequently sold on online auction sites and in opportunity shops. Weck jar A Weck jar is a molded glass jar used in canning to preserve food. It is popularly used for jam preservation, for its minimal look and foolproof rubber gasket with a glass lid. Weck jars were created by the
Alain de Weck started investigating the occurrence and root causes of inflammation as well as contact dermatitis due to lymphocytes using the guinea pig nipple as a model for the human skin. This led to the first histopathological demonstration that contact dermatitis is due to sensitized lymphocytes. He then stayed - as the first U.S. Public Health Service funded foreign research fellow from Switzerland - at Barnes Hospital at Washington University in St. Louis from 1958 to 1960 under the guidance of Prof. Herman Eisen. During this time, Alain de Weck made initial contributions to what later became one of his signature research