A Note About Temperature Changes and Cracking
Keep in mind that glass may crack when subjected to sudden temperature changes. This is why jars are washed in hot water just before placing them into the pot with hot water. Placing cold jars in boiling water, or pouring cold liquids into hot glass may cause jars to crack. Once the canning is complete, allow the jars to cool to room temperature, and avoid sudden temperature changes.
Using Your Jars in the Freezer
If you plan to place jars in the freezer, it’s important only to use wide mouth jars with straight sides. (“Shouldered” jars are not suitable for freezing because as the food expands, breakage often occurs.)
Azure Canning Co. offers TWO jars styles that are suitable for freezing:
Our pint-and-a-half, wide-mouth, 24 oz jars
Our pint, wide-mouth, 16 oz jars
TIPS
Leave at least one inch headspace. Cool the filled jars gradually—allow them to come to room temperature, then place in the refrigerator, and finally place them upright in your freezer. To protect against cracking, do not tighten the lids until the contents are fully frozen.
Once you’ve reused your jars a few times, you may notice a whitish residue on the glass. To remove, simply add ¼ cup white vinegar to the water when sterilizing.
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