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Canning -- Tomatoes
What would cause tomato sauce to spoil?
If tomato sauce products like tomato sauce, chili sauce, ketchup or even applesauce, spoil despite processing for the recommended time, the product was probably not hot enough when poured into the jars. Because these products are thick, heat penetration is slow during processing. For the processing times indicated the products must be boiling hot when placed into the canning jars.
Products will have a tendency to splatter near the boiling point so be sure to protect your hands, arms, and any other exposed skin area.