The routes

Acidify it instead

Updated October 2026

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What it changes Which is lighter but not light Equilibrium is the hard word Which is why chunky products are the difficult case And it changes the product So it suits some leaves and not others Measure, do not assume References

The second route out: get under 4.6 deliberately, which is its own discipline.

What it changes

A food with a finished equilibrium pH of 4.6 or below is not a low-acid food within the definition, so part 113 does not apply. Acidified foods have their own regime at 21 CFR part 114.

Which is lighter but not light

Part 114 has its own requirements including a scheduled process, process establishment, records and an understanding of equilibrium pH. It is the regime behind every shelf-stable pickle, and the written site on Pickles covers it in detail.

Equilibrium is the hard word

The pH that matters is the finished equilibrium figure, after solids and liquid have come to the same acidity. For a chunky product that takes time and the center of a large piece is the last place to get there.

Which is why chunky products are the difficult case

A thin dressing acidifies predictably. A soup with vegetable pieces in it has to get the acid into the middle of every piece, and the measurement that matters is taken after that has happened.

And it changes the product

Acidified soup tastes acidified. For some products that is fine or even desirable, and for a bone broth it is usually not. The honest question is whether the product you want survives the treatment.

So it suits some leaves and not others

A deli dressing or a salsa-style dip takes acidification naturally. A broth, a stock or a cream soup generally does not, and forcing it produces something nobody wanted.

Measure, do not assume

A calibrated pH meter on the finished equilibrated product. Litmus paper and a recipe that worked are not measurements, and 4.6 is close enough to ordinary food pH values that the margin matters.

References

21 CFR part 114, Acidified foods, the regime for foods to which acid or acid foods are added to produce a finished equilibrium pH of 4.6 or below, which is the alternative route for a product that would otherwise be low-acid. law.cornell.edu

21 CFR 113.3, the definitions for thermally processed low-acid foods packaged in hermetically sealed containers. Paragraph (j) defines a hermetically sealed container as one designed and intended to be secure against the entry of microorganisms so as to maintain commercial sterility; (n) defines low-acid foods as those with a finished equilibrium pH greater than 4.6 and a water activity greater than 0.85, excluding tomatoes and tomato products below pH 4.7; (r) requires a scheduled process at least equivalent to one established by a competent processing authority. law.cornell.edu

Written from federal regulation, not from a production kitchen. Nothing here is a scheduled process, and nothing here is a substitute for a competent processing authority. If you are considering a shelf-stable low-acid product, the first call is to a process authority rather than to a packaging supplier.