106
These are lids from freshly open jars of home canned pickles. Is this mold I'm seeing?
(sh.itjust.works)
If so, I’m assuming they would not be safe to eat, correct?
this post was submitted on 26 Oct 2025
106 points (99.1% liked)
Ask Lemmy
35632 readers
1885 users here now
A Fediverse community for open-ended, thought provoking questions
Rules: (interactive)
1) Be nice and; have fun
Doxxing, trolling, sealioning, racism, and toxicity are not welcomed in AskLemmy. Remember what your mother said: if you can't say something nice, don't say anything at all. In addition, the site-wide Lemmy.world terms of service also apply here. Please familiarize yourself with them
2) All posts must end with a '?'
This is sort of like Jeopardy. Please phrase all post titles in the form of a proper question ending with ?
3) No spam
Please do not flood the community with nonsense. Actual suspected spammers will be banned on site. No astroturfing.
4) NSFW is okay, within reason
Just remember to tag posts with either a content warning or a [NSFW] tag. Overtly sexual posts are not allowed, please direct them to either !asklemmyafterdark@lemmy.world or !asklemmynsfw@lemmynsfw.com.
NSFW comments should be restricted to posts tagged [NSFW].
5) This is not a support community.
It is not a place for 'how do I?', type questions.
If you have any questions regarding the site itself or would like to report a community, please direct them to Lemmy.world Support or email info@lemmy.world. For other questions check our partnered communities list, or use the search function.
6) No US Politics.
Please don't post about current US Politics. If you need to do this, try !politicaldiscussion@lemmy.world or !askusa@discuss.online
Reminder: The terms of service apply here too.
Partnered Communities:
Logo design credit goes to: tubbadu
founded 2 years ago
MODERATORS
you are viewing a single comment's thread
view the rest of the comments
view the rest of the comments
Rust or mold, it doesn't really matter. As other have said it's on the outer part of the circle - the bit contacting the outer glass thread. The inner circle is the plug that contacts the contents and is clear.
If it feels scratch with a finger nail its rust, if it's soft and scrapes off its mold. But as I said it's not in contact with the contents so it doesn't matter.
Also the contents of the jar are pickled. That means brine or vinegar, which is highly acidic and is what keeps the food fresh/prevents mould and bacteria. So if the pickles themselves look fine then they'll be fine to eat. If the pickling had failed the contents would be mouldy.
Rust would make sense as the content of the jar is acidic and acids accelerate rust. There could be small pockets of air left at that location when you seal the jar and some fluid inevitably gets forced out as it is sealed; air plus acid is perfect for rust. But the jars internally themselves were otherwise well sealed as there is no rust in the inner bit of the circle, suggesting it plugged the jar contacting the fluid directly and no gas was left.
This likely reflects the jar lids are not quite perfect for the jar or possibly not screwed on to their perfect max tightness leaving air behind at those locations. But they were screwed on well enough to seal the content.