A jar that did not seal

Check after cooling, not before

A lid still pulling down looks like a failure and produces unnecessary reprocessing, which costs texture and color on a product that just spent a process protecting both. Let them cool fully, then check.

Why a thick sauce fails at the rim more often

Product on the rim does not run off. A thin sauce that splashes clears itself; a thick one sits where it landed and goes under the lid. That makes the wipe step more load-bearing here than in most crafts, and it is the step that disappears when a day runs late.

The two honest options

• Refrigerate and sell it short-life. Simplest, and it keeps the jar out of the shelf-stable line entirely.
• Reprocess promptly with a new lid. It costs color and texture, which is the trade.

Not on the list: shipping it and hoping, or setting it aside to decide tomorrow. An unsealed jar at room temperature is not a jar whose status can be re-established in the morning by looking at it.

A pattern is a process problem

One failure in a run is ordinary. A rate is telling you something upstream about headspace, rim cleanliness or lid handling, and the answer is to look there rather than to build a habit of reprocessing.

Separate them physically

In a commercial run the control that matters is not attention, it is that a failed jar cannot get into a case. Seals checked at a defined point, failures moved somewhere they cannot be packed by mistake, and a written rule about what happens to them. A reflex is not a control, and the day it fails is the day somebody else is packing out.

Keep the count. A seal failure rate you can quote is a number that tells you whether a change helped; a vague sense that it happens sometimes is not.

References