What goes wrong

The batch is inconsistent

Updated October 2026

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Where variation comes from Why it reaches the safety case The fix is dull and it works It is what lets you supply rather than sell Measure the finish, not the clock References

Variation between batches is the failure a wholesale buyer notices first, and here it is more than a quality problem: viscosity drives heat penetration, so a thicker batch is a batch whose process may not have been adequate.

Where variation comes from

Ingredients weighed by volume rather than by weight.
Reduction judged by eye, so the finished solids differ batch to batch.
Seasoning adjusted at production rather than fixed at formulation.
Fill weight packed by eye, which is also a label claim.

Why it reaches the safety case

This is the consequence of the conduction problem. If the process was established for a product at a given thickness, a batch that came out thicker has a longer heat path to its center than the one the process was measured on. That is why the log on this property records a thickness measure rather than a note saying it looked about right.

The fix is dull and it works

Weigh everything, including the finished batch. Measure the solids rather than judging them. Fix the seasoning at formulation and hit the formulation in production. A scale removes most of this page and is the cheapest equipment in the operation.

It is what lets you supply rather than sell

A market customer buys a jar. A wholesale buyer buys a specification and expects every delivery to meet it, and the first inconsistent case is the one that ends the relationship. Consistency is the thing that separates a maker who can supply from one who can only sell.

Measure the finish, not the clock

The common mistake is to standardize the cooking TIME and let the finished thickness fall where it may, because time is the easy thing to write on a sheet. It is backwards: time is an input that varies with the batch, the ambient conditions and the equipment, while the finished solids are what the process was established against. Cook to a measured finish and record how long it took, rather than cooking for a set period and recording what you got.

The log is where this becomes visible. Three batches that each looked right on their own day will show their spread immediately once the finished weights sit in a column.

References

21 CFR 114, Acidified Foods, including the 114.3 definitions and the exclusion list. Code of Federal Regulations, Title 21. law.cornell.edu

National Center for Home Food Preservation. Salsa and sauce recipes, and the warning that altering the proportion of low-acid ingredients changes the safety of a tested recipe. nchfp.uga.edu

Written from federal regulation and published extension guidance, not from a laboratory. An acidified food is a federal category with a filed process behind it, and your state enforces it. Anything here is a starting point for a conversation with your state department of agriculture and a process authority, not a determination that you comply.