How to Read a Certificate of Analysis for Vinegar and Condiments

Every shipment of food ingredients arrives with a certificate of analysis, and most of them are filed without being read. That is a missed opportunity, because the document is the only place where a supplier's claims meet a measurement.

What it is, and what it is not

A certificate of analysis reports measurements taken on one production lot. It is not a specification sheet. A specification says what the product should be; a certificate says what this particular lot was found to be, on a stated date, by a stated method.

The distinction decides how the document is used. A specification can be filed once and referred to for years. A certificate is only as relevant as the lot it belongs to, and a certificate that does not name a lot is not a certificate at all.

Five fields, and what each one has to carry

The lot number, and it must be the number printed on the pallet and on the pack. This is the field that makes everything else traceable; without it, the results describe nothing you can point to.

The production date and the analysis date. The analysis follows the production. A certificate whose analysis predates the lot it describes is either a clerical error or a template that was never filled in.

The parameter, the result, and the specification. Three values, not one. A result on its own says nothing: 5.1% is excellent against a 5% ± 0.3 specification and a rejection against 6% ± 0.2.

The method. Titration, potentiometric titration, a plate count — the result is only comparable to another lab's result if the method is the same. A certificate that reports figures without naming methods cannot be checked by anyone.

The signature and the function. Someone in the quality organisation takes responsibility for the release. An unsigned certificate commits no one.

What is actually measured on vinegar

Three families, and each answers a different question. Acidity answers whether the product meets its identity and will preserve as intended — it is the master parameter and the one the purchase order names. Density answers whether the composition matches: a lot on specification for acidity but off on density has had something else change. Microbiological conformity answers whether the product is safe and stable in the pack.

On condiments the list grows, because water activity, salt content and the state of the raw material all move. But the logic does not change: each figure exists to answer a question, and a figure whose question you cannot state does not need to be on the certificate.

Five things that should stop you

No lot number, or a lot number that does not match the pallet label. Results identical to the last decimal across several lots, which fermentation does not produce and which usually means a copied template. A specification with no method. No signature or no named function. And an analysis date that sits before the production date.

None of these prove bad faith on their own. All of them mean the document cannot support a claim if a customer or an authority asks.

What to do with it after arrival

Two habits turn a filed document into a working one. File the certificate against the lot, not against the supplier, so that a query six months later finds the right paper in one step. And know whether the supplier keeps a retained sample of that lot, and for how long: without one, a disputed result can only be re-tested against material that has already travelled and been stored, which tests your warehouse as much as the supplier's plant.

What we issue

Every lot we release is checked for acidity, density and microbiological compliance, and the figures are recorded against the lot number. A retained sample is kept so that a disputed result can be re-tested against the original material. The control plan is set out on our quality control page, the process on the manufacturing page, and the schemes we hold on the certifications page.

If you want to see the format before committing to a first order, ask us for a specimen certificate on any product in the range.