None. The preservative is the method being used to process the soup, usually a pressure cooker.
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you should read the ingredients to find out
The most popular material for home canning jars is glass.
Commercial canning is done on a far greater scale than home canning. Other than that commercial canning includes methods not used in the home such as pasteurization and ionizing radiation. One more big difference is the types of containers used in commercial canning include tin-lined steel cans that require an opener to slice the lid from the can, and laminate vacuum pouches used for fruit drinks and other liquids. Home canning uses primarily glass jars with 2-piece lids. Finally, more chemicals are used in commercial canning than in home canning.
You should not be adjusting the pH levels in home canning recipes. Recipes are tested scientifically to be safe when prepared using home canning equipment and techniques. Follow a tested recipe and adjust only the spices.
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Following are the items needed to begin canning at home: water bath canner, pressure canner and cooker, canning rack, jars, jar lifter, magnetic lid lifter, wide neck canning funnel. In addition, there are canning kits available that make obtaining materials easier.
Janet Cooper has written: 'Home canning and preserving' -- subject(s): Canning and preserving, Cookbooks
Evelyn H. Johnson has written: 'Home canning' -- subject(s): Canning and preserving
sugar, salt and vinegar
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If you are asking about Ball-brand home canning products, that business was spun off in 1993. For information on Ball jars, the Ball Blue Book and other canning products, visit the Jarden Corporation at www.homecanning.com.