A wrong dimension can be sorted, a wrong colour on a plastic part can sometimes be lived with. A wrong address on a printed box, a missing marking, a barcode that does not scan or a language that the destination country requires and the box does not have: those are reprints, and the reprint is on top of the packaging you already paid for. The defence is not care — everyone is careful — it is a loop with one physical object at the end of it.
A proof is not a file you sent
In a messaging app, « ok » is an answer to the last image someone posted. Nobody can say later which file that was, who was entitled to approve it, or whether the version that went to the press is the one that received the « ok ». A proof is a specific object: a named file, a version, a date, a named person on each side, and a signature. Everything else is a conversation.
The reason to be strict about this is not legal, although it helps when a reprint has to be paid for by someone. It is that the discipline itself catches errors. Filling in a proof sheet forces someone to look at each element separately — the marking, the address, the net content, the code — instead of glancing at a whole box and finding it familiar. Familiarity is what makes a wrong box look right.
Screen proof and printed proof are two different checks
A file on a screen checks the content: wording, spelling, the presence of each required element, the structure of the layout. It is fast, it can go round several times in a day, and it is where nearly all textual errors should be caught. What it cannot check is anything physical, because a backlit screen and an ink on a substrate are not the same object.
- Colour on the actual material. The same reference prints differently on white coated board, on kraft and on a film. A screen shows none of it.
- Small print. Legal mentions, warnings and units that are legible at screen magnification and unreadable at their printed size.
- The barcode. It has to be scanned on the printed proof, on the final material, with a real scanner. Contrast and substrate decide this, not the file.
- Folds and the die line. Where the text lands once the box is assembled, what falls on a crease, and what disappears under a flap.
- Finish. Varnish, matte lamination, hot foil and embossing change the colour and the legibility of what is underneath them.
The mentions change with the destination market
What has to appear on the packaging is decided by where the product is sold, not by where it is made. In the European Union the mechanism is constant across product law: the European text sets an obligation of result — the information must be in a language easily understood by the user — and leaves each member state to determine which language that is on its territory. Multilingual labelling is allowed and is usually the cheapest way out of the problem.
The practical consequence is that « for Europe » is not a specification. You have to name the countries, and the artwork has to be built so that adding one later does not mean redesigning the panel. Beyond language, the elements that move from one market to another are the identity and address that must appear, conformity markings where they apply, and the national sorting or producer responsibility marks. There is no reliable, up-to-date public table of all of this country by country — the right reflex is to ask, for each market you are entering, before the file is built rather than after.
Versioning, and who owns the master
- One owner of the source file, on your side. The factory receives exports, never the editable master, and never becomes the place where the current version lives.
- A version in the file name and printed in the file itself, somewhere that survives — on the glue flap, in the die line area, anywhere that is not seen by the customer but is visible on the printed sheet.
- The purchase order names the version to be printed. Not « the artwork »: the version, the date, and the approved proof it corresponds to.
- Any change, however small, creates a new version and a new proof. A corrected address is a new version. This is the rule people break, and it is the one that produces mixed pallets.
- The old versions are archived and withdrawn from the shared folder, so that the most recent file is also the only one anybody can reach.
Two things belong in the same loop because they are printed the same way and forgotten the same way: the outer carton markings, which carry the shipping information a warehouse actually reads, and any printed insert or manual. A perfect retail box in a shipper with the wrong reference on it is still a problem at the receiving dock.
The rule that saves the run: nothing goes on press until a physical printed proof, on the final material, has been signed and dated by a named person on your side — and a copy of that signed proof stays with each party. Everything upstream is preparation; that signature is the moment the packaging becomes real and irreversible.