What is a printing proof and why should it be approved before production?

A printing proof is a preview of the final label, either digital or physical, showing colours, layout, text, and finishing exactly as they will appear once printed, and it should be approved before production because it is the last checkpoint to catch errors before a full run is committed to material, ink, and machine time.

Digital proofs, typically a PDF or on-screen colour-matched preview, allow a quick check of text accuracy, layout, and general colour direction, but screen and desktop printer colours do not always match what a production press will produce, particularly for exact Pantone spot colours or metallic finishes. A physical or press proof, printed on the actual substrate using production-representative equipment, gives a far more accurate preview of true colour, finish, and how the label will look and feel on the final container.

Because flexographic printing in particular involves committing to plates and machine setup that are costly to redo, an error caught at the proof stage, whether a wrong regulatory statement, an incorrect batch code format, or an off colour, is far cheaper to fix than the same error discovered after tens of thousands of labels have already been printed. Proof approval is typically a formal, documented step, since it establishes what the brand signed off on and protects both the brand and the manufacturer if a discrepancy is later identified between the approved proof and the delivered production run.