I have had trouble with home canned ketchup and tomato sauce spoiling even though I processed them for the recommended times. What did I do wrong?
If home canned tomato sauce, chili sauce, ketchup or applesauce spoils in spite of processing for the recommended times, the product was probably not hot enough when poured into jars. Because these products are thick, heat penetration during processing is slow. For the recommended processing times to be adequate, these products must be packed boiling hot into jars. Although spattering at temperatures near or at boiling makes this difficult, it is essential for adequate processing. Also, make sure you are following current (1989 or later) University Extension publications and that you are adjusting for altitude if necessary.
Barbara Willenberg, Nutritional
Sciences, University of Missouri-Columbia
Last update: Tuesday, May 05, 2009