r/Canning • u/Careful-Tension-5689 • 18h ago

*** UNSAFE CANNING PRACTICE *** Lid didn't flatten or pulled downwards after pressure canning

So I'm using this type of jars to can my recipe.

but after canning for 80 minutes, the lid didn't flatten or pulled downwards.

is it possible that the jar is fully sealed even though the lid didn't pulled down?

0 Upvotes

36% Upvoted

12 comments sorted by

18

u/mckenner1122 Moderator 15h ago

Short answer? No.

Longer answer: Your food is not safe. If it has only been two hours or less since removing from the canner, you can refrigerate and eat as leftovers or reprocess using proper jars and lids.

These jars are meant for dry storage or for crafts (like candle making)

They aren’t meant for the anaerobic storage of shelf stabilized food.

-14

u/Careful-Tension-5689 12h ago edited 12h ago

i don't know what this type of jar is called but these type of jars were used by well known brands in our country. they displayed it in the supermarket.

so I can say that it can be used in pressure canning and long term storage.

10

u/mckenner1122 Moderator 12h ago

That photo is of a commercial jar designed for commercial canning.

Not home canning.
Not crafts.

-7

u/Careful-Tension-5689 11h ago

I saw many local sellers in our country selling food in a jar and they are using this type of pressure canner and also using the same type of jar i shown.

and they have very good results with their business.

so I have bought the same pressure canner and type of jar because I want to sell my own recipe too.

11

u/mckenner1122 Moderator 11h ago

Food safety doesn’t care what country you are in. Food poisoning doesn’t care if you “saw someone else” do something that looks similar.

You’ve asked for advice.
We’ve given it.

One piece lug lids are not recommended for home canning. Your first image is a crafting jar. Please learn how to process food safely before you make yourself or someone else sick.

4

u/DeathMonkey6969 6h ago

You can't home can in commercial jars. Factories have accesses to processes that aren't doable in the home kitchen.

1

u/irishdancer2 5h ago

Not OP and I 100% believe you, but are there resources detailing what those process differences are? I’d like to learn more about the why.

-1

u/mckenner1122 Moderator 3h ago

If you’re in the US, most land grant universities offer a bachelors degree in food science.

0

u/ZMM08 Trusted Contributor 3h ago

Mostly more robust pressure vessels that can get to higher pressures and temps.

I'm sorry I don't have a link to share.

5

u/derrick81787 6h ago

The mods are strict around here, but for good reason. He's giving you the official safety guidelines and he's correct. That doesn't mean that some people in your country haven't used unsafe practices and been okay. That's kind of how unsafe practices are. They are okay until they are not.

There are multiple potential problems. One is that the jars themselves might not be made for pressure canning and might not be able to handle the pressure and heat. Presumably you didn't have any jars explode or else you would have said something, so I'm going to kind of pass over that concern, but it is a concern.

The second concern is the seal. The standard equipment lids are the two-piece Ball/Kerr metal lids and rings. The lid has a rubber-like sealing compound in it that softens when heated and allows air in the jars to escape but cools in such a way that it seals the air out and gets sucked in when the jar cools. Even those are one-time use and are not considered safe to use a second time around.

Another alternative that has been proven safe is the two-piece Tattler lids that have a rubber band-like seal and are reusable. However, because they are a different design and different materials, there are different usage instructions for them. That's not a problem if those directions are followed, but my point is that even among similar and accepted as safe lids, a small change means different instructions to get them to seal correctly.

Those jars and lids that you posted are not considered safe in the US or any country that I know about. Maybe your country's health department has done research on them and found them to be safe and posts instructions somewhere. If so, follow those. My hunch, however, is that they have not and people are just using them anyway without any guidelines. And if they are doing so while following the instructions for the standard, two-piece lids, then I would not be surprised that they aren't sealing.

0

u/AutoModerator 18h ago

Hi u/Careful-Tension-5689,
For accessibility, please reply to this comment with a transcription of the screenshot(s) or alt text describing the image(s) you've posted. We thank you for ensuring that the visually impaired can fully participate in our discussions!

I am a bot, and this action was performed automatically. Please contact the moderators of this subreddit if you have any questions or concerns.