Botulism in Canned Foods: How to Reprocess Jars That Didn’t Seal

Home-canned food is packed to the brim with all the good stuff. Lots of nutrients, vitamins, minerals, and of course, lots of flavor. 

One thing we don’t want our home-canned food to include, however, is bacteria.

Botulism is one dangerous pathogen that you just don’t need hanging around your food. Silent and invisible, this bacteria can be deadly.

The good news is that it’s fairly easy to prevent it from setting up shop in your jars. One of the easiest ways to do this is to reprocess jars that didn’t seal properly. In this post, we’ll walk you through how to do just that.

What is Botulism in Canned Foods?

Botulism is a rare but serious illness caused by a toxin produced by the bacterium Clostridium botulinum. This toxin can be present in improperly canned or preserved foods, especially those that are low in acid and have not been processed correctly. 

When canned foods are not processed at high enough temperatures or pressures to kill the spores of Clostridium botulinum, the bacteria can thrive in the anaerobic environment inside the sealed jar, producing toxins that can lead to botulism when consumed.

Symptoms of botulism include blurred vision, difficulty swallowing, muscle weakness, and even paralysis. This is something you definitely don’t want to mess around with!

Avoiding Botulism in Canning

Now that you know what botulism is, how do you keep it out of your food? Here are some tips.

Be Mindful of Low Acid vs. High Acid Foods

Low acid foods like vegetables and meats need to be canned using a pressure canner to kill any harmful bacteria. High acid foods, such as fruits and pickles, can be safely canned using a water bath canner.

This is one of the most common ways botulism gets into canned food, so make sure you prevent it by selecting the right type of canner and recipe for the food you want to can.

Use Tested Recipes

Always use recipes that have been tested for safety. These will provide specific instructions on processing times and methods. While it might be tempting to get creative and try unique new combinations, canning isn’t the time to flex your creative muscles. Stick with tried and true!

Check Seals

After you’re done canning, make sure you carefully inspect each jar to make sure it’s sealed properly. Just press down gently on the lid. If it pops back up under the pressure, it hasn’t sealed well and you’ll need to reprocess the jars.

Follow Processing Times

Again, this is where reading and following tested recipes is so important. Follow the processing times listed on the recipe to a T. Don’t veer from them. If you’re using a pressure canner, make sure you reset the timer if the pressure dips below the required level.

Discard Spoiled Food

If you notice signs of spoilage, like mold, funky smells, or leaking, it’s better to be safe and throw the food out. While botulism often doesn’t present any signs of spoilage like these, you definitely don’t want to gamble with this or any other type of bacteria.

Wash Hands Well and Sterilize Your Jars

Cleanliness is next to godliness, and nowhere is that more true than when you’re canning. Wash your hands well and make sure your kitchen is clean and tidy before you start canning. Your jars and rings also need to be cleaned and sanitized.

Reprocess Food That Didn’t Can Properly

Last but not least, if you have jars that didn’t seal properly after the canning process, it doesn’t hurt to reprocess them. Sometimes jars just don’t seal on the first try, and in most cases, it’s safe to reprocess the food. We’ll tell you how to do that below!

Why Didn’t My Jars Seal Properly?

If your jars didn’t seal well, there are a few reasons why this might happen (fortunately, most are easy to address):

• The Jar Rim Was Chipped: A chipped jar rim can prevent a proper seal from forming, as it may not allow the lid to make full contact with the jar.
• You Didn’t Fill Your Jars Properly: Incorrectly filling jars, either with too much or too little headspace, can affect the sealing process.

• There Was Food or Grease on the Rim of the Jar: Any debris or residue on the jar rim can interfere with the seal, preventing it from forming tightly.
• You Didn’t Center Your Jar Lids: Placing lids off-center on the jars can lead to an improper seal, as the lid may not adhere to the jar rim uniformly.
• You Overtightened the Rings: Tightening the rings excessively can hinder the proper formation of a seal, as it may prevent air from escaping during processing.
• Your Processing Time Was Off: Not processing the jars for the correct amount of time can impact the sealing process, leading to inadequate seals.
• Altitude Adjustments Weren’t Made: Altitude can affect canning processes, so it’s essential to adjust processing times and pressures accordingly for your location.
• The Wrong Type of Jar Was Used: Using inappropriate jars, such as recycled jam jars instead of proper canning jars, can result in failed seals due to differences in design and quality.

How to Reprocess Jars That Didn’t Seal

If your jars didn’t seal correctly during canning, there are a few simple steps you can follow to reprocess them.

First, check for nicks. Take a close look, especially at the rims, for nicks or any other damage. If you find any, switch to new jars to make sure you get a proper seal.

Then, put a fresh lid on the jar. Even if you’re using the original jar, take some time to replace the lid with a new one to improve your chances of sealing it.

Next, reprocess the jars. Can they use the same processing time as before to make sure they seal properly.

After canning, let the jars cool. Don’t put them in water to rush the process, as this can prevent the seals from setting.

Listen for the characteristic “ping” sound that indicates a successful seal after the jars cool down. 

If the jars still don’t seal correctly, transfer the contents to freezer-safe containers and freeze or refrigerate them instead to keep them safe.

Final Thoughts

Canning is one of the best ways to preserve food, but you need to do it safely. By following these tips and using the right canning equipment, you can enjoy your homemade canned foods without worry – and with confidence.

Stay safe, stay vigilant, and stay ahead of botulism. With these tips, you definitely can!

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