Mistakes commonly made when pressure canning include:
- Taking “short cuts.” Recommended preparation and processing instructions should always be followed.
- Using jars not specifically designed for home canning. Commercial glass jars with screw-on lids should not be used when canning.
- Using outdated canning books or instructions. Updated (within the past 10 years) canning books and instructions should be used.
- Using untested recipes. Canning recipes should always be sought from a reliable source such as your local extension office
For more, go here. Thanks to Extension Service, USDA.