Before te day of the pressure canner, and before we knew much about what went on in a jar of canned food, spoilage was much too common in home-canned food. LEss spoilage today is probably due to a number of things. We can get our equipment and foods cleaner with running water in the kitchen. The pressure canner has come into common use. And more homemakers are using tested and approved canning methods.
"Home-Canned Food Spoilage-You Can Avoid It,"
Iowa Farm Science: Vol. 5
, Article 6.
Available at: https://lib.dr.iastate.edu/farmscience/vol5/iss3/6