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What are Pinholes in Canning Lids?

Posted on by Karen Blakeslee

Natural compounds in some foods, particularly acids, corrode metal and make a dark deposit on the underside of jar lids. This deposit on lids of sealed, properly processed canned foods is harmless. This is commonly referred to as pinholes.

Sometimes they are caused by how the lids are handled. Lifting lids out of water with a metal tool may scratch the enamel on the lid providing a pathway for acids to work their way through the lid. More often, it is simply a chemical reaction with the metal and the food in the jars. As a reminder, today’s canning lids do not require pre-heating prior to applying them to the jar. Simply wash and dry them and they are ready to use.

Pinholes are harmless unless holes go all the way through the lid. Salt can also cause corrosion on lids. Using proper headspace can reduce contact of the food with the lid. If food is stored too long, acids may create pinholes. Discard the contents of any jar if the pitting has gone completely through the lid — the jar would be unsealed and the contents could be unsafe.

Sources: https://nchfp.uga.edu/questions/FAQ_canning.html#13 and https://extension.psu.edu/frequently-asked-preservation-question-pinholes-in-lids

About Karen Blakeslee

The Rapid Response Center was formed in 1995 as a resource for Kansas State University Research & Extension Agents. Resource topics included Food Science, Human Nutrition, Food Service, Textiles, Home Care and other consumer topics. Since that time, the Center has grown to be of valuable assistance to Kansas State University Extension Specialists in those areas.
230 thoughts on “What are Pinholes in Canning Lids?”

  2. If a lid pops up after several months (my experience with sauerkraut ) but the lid is sealed is the sauerkraut safe?

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  29. Pinholes in canning lids are tiny, often microscopic holes that can compromise the seal of canned foods. These small imperfections allow air or bacteria to enter, potentially spoiling the contents. Detecting pinholes before use is crucial for food safety. Always inspect lids carefully, and avoid using any with visible damage to ensure your home-canned foods stay fresh and safe.
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