How to test the seal when canning

After jars have cooled, test for seal. To do this press down on the center of the lid. The lid should be con-caved and not move when pressed. Another method is to tap the lid with the bottom of a teaspoon. If the jar is sealed correctly, it will make a high-pitched sound. If it makes a dull sound it means the lid is not sealed or possibly that food is in contact with the underside of the lid.

When completely cool, the screw bands may be removed if desired but not necessary. Be sure to label canned jars with content and processing date. Store jars in a cool dark, dry place. If there is a possibility of freezing temperatures during storage, cover with a blanket or heavy cloth. Jars may also be placed in a box and stuffed with newspaper.