Labels that are supposed to be difficult
Most label design work is about making something easy: easy to read, easy to apply, easy to keep looking good on a shelf. Security labels invert that. Their job is to make one specific thing hard, whether that is opening a package without leaving evidence, moving a label from one item to another, or producing a convincing copy.
The category covers a wide range, from a simple void-on-removal seal to layered constructions with several verification features. Choosing sensibly means being clear about which threat you are addressing, because a label that resists copying does nothing about tampering, and a tamper seal does nothing about counterfeiting.
Start with the threat, not the feature
Three quite different problems get lumped together under security, and each has its own answer.
Tampering
Someone opens a package, alters the contents and closes it again. What you need is evidence of opening, visible to whoever receives it. The label does not prevent the act; it makes it undeniable.
Transfer and substitution
A label is peeled off one item and applied to another, or a genuine label is reused on a counterfeit product. Here the label must destroy itself on removal, so it cannot be reapplied intact.
Counterfeiting
Someone reproduces the label so a fake product looks legitimate. The answer is features that are hard to replicate and, importantly, easy for the right person to verify. A security feature nobody checks is decoration.
Write down which of these three you actually face before looking at any product. It is common to specify an expensive feature that addresses a threat that was never the issue.
The main constructions and what they do
| Type | Behaviour | Addresses |
|---|---|---|
| Void or message-release | leaves a pattern or word on the surface when lifted | tampering, transfer |
| Destructible face stock | fragments into small pieces on removal | transfer, reuse |
| Tamper-evident seal | breaks across an opening or a flap | tampering |
| Holographic film | changes appearance with viewing angle | counterfeiting |
| Sequential numbering | unique identifier on every label | tracking, verification |
| Covered code | scratch-off panel hiding a unique code | verification, first-use detection |
| Hidden inks | visible only under a specific light source | covert verification |
| Microtext | text too small to reproduce by ordinary copying | counterfeiting |
Most real specifications combine two or three of these. A common and effective pairing is a destructible or void face stock carrying a unique number, which covers transfer and gives you something to check against a record.
Overt, covert and forensic
Security features are usually described in three layers, and a good specification uses more than one.
Overt features are meant to be seen and checked by anyone: a hologram, a colour-shifting element, a visible seal. Their strength is that verification needs no equipment. Their weakness is that they are the first thing a counterfeiter attempts to imitate.
Covert features are hidden and need something to reveal them, such as an ultraviolet lamp or a magnifier. They are checked by staff or inspectors rather than by customers.
Forensic features are undetectable without laboratory analysis. They exist to prove authenticity after the fact, typically in a legal context.
The reason to layer them is simple. A counterfeiter who copies the visible feature convincingly still fails the covert check, and by the time they learn about that layer you have already changed it.
Materials and adhesives do most of the work
The clever part of a security label is often not the printing but the construction. A void label works because the adhesive bonds more strongly in patterned areas, so lifting splits the layers. A destructible label works because the face material has almost no tear strength.
That makes surface and application conditions critical. A destructible label applied to a rough or low-energy plastic may lift cleanly instead of fragmenting, defeating the whole purpose. A void label applied to a powder-coated surface may take the coating with it rather than leaving its message. Temperature at application matters too, since adhesives need time and warmth to reach full bond strength.
The practical rule: test on the actual surface, in the actual conditions, before committing to a run. General guidance on material choice is in choosing durable label materials that actually last, and curved or awkward surfaces bring their own issues, covered in bottle and jar labels.
Unique codes only work with a system behind them
Sequential numbers, barcodes and unique codes are among the most useful security measures, and also the most often wasted. A number printed on a label proves nothing unless something can be checked against it.
Before specifying unique codes, answer four questions. Who checks a code, and at what moment? What do they check it against? What happens when a code does not match, or when the same code is checked twice? And who maintains that record over the life of the product?
If those answers are not clear, a simpler tamper-evident label may deliver more actual protection than an unverified numbering scheme. Where the answers are clear, the printing side is well understood, and the mechanics of putting different data on every piece are described in variable data printing.
What these labels cost you beyond the price
- Higher unit cost. Specialist films and multi-layer constructions cost more per label than standard stock.
- Minimum quantities. Some materials are only produced in larger volumes, which affects small runs.
- Lead time. Speciality films and custom holographic tooling are not held in stock everywhere.
- Application difficulty. Destructible stocks are fragile by design and are harder to apply by hand or on some machines.
- No second chances. A misapplied destructible label cannot be repositioned. Expect a higher rejection rate.
- Ongoing process. Security features need reviewing periodically, and codes need somebody to maintain the record.
None of these is a reason to avoid security labelling. They are reasons to match the level of protection to what is genuinely at risk rather than specifying the most impressive option available.
Design details that get overlooked
A few practical points come up repeatedly.
Keep critical printed content away from where a void pattern or perforation runs, because the two will interfere visually. Leave room for the numbering field and confirm its position, since variable elements are often applied in a separate pass. Check how the label reads once it is partially destroyed, because a tamper seal that becomes illegible tells the recipient nothing useful.
Think about the unwind direction and format if the labels are machine applied, as covered in roll labels vs sheet labels. And consider whether a laminate is compatible with the security feature, since some films dull a holographic effect or interfere with a scratch-off panel.
Plan for the label to change
Treat a security specification as something with a lifespan rather than a permanent decision. Anything reproducible will eventually be reproduced, and a feature that has been in the field unchanged for years is the easiest one to imitate. Build in a review point, note which elements you can vary without retooling, and keep a dated record of what was in use during each period. That record is what lets you say with confidence that a label presented to you in two years does or does not belong to the run you authorised.
Tell people how to check
The most common failure of security labelling has nothing to do with the label. It is that nobody was told what to look for. A hologram on a box protects nothing if the person receiving it has never seen a genuine one and would not know a fake.
Whatever you specify, produce a short instruction for the people who will check it: what the genuine feature looks like, what to do if it is missing or wrong, and who to contact. One page with photographs is usually enough, and it turns a printed feature into an actual control.
How we approach security labelling
We start by asking what you are protecting against, because the answer usually narrows the options quickly. If the concern is opening in transit, a tamper-evident seal on the right substrate solves it at modest cost. If the concern is counterfeit product in a distribution chain, that is a different specification and a different budget.
We supply samples on the actual material for testing on your surfaces before any run, since adhesive behaviour is the most common source of disappointment. For numbered work we confirm the data format and check the sequence before printing. You can see the range under print quality and materials and across printing services. Related packaging options are described in folding carton packaging. To discuss a specification, use our contact page, and there is more about us on the about page.
The short version
Decide first whether you are addressing tampering, transfer or counterfeiting, because each needs a different construction. Layer an overt feature that anyone can check with a covert one that only you check. Remember that most of the security lives in the material and adhesive, so test on the real surface in real conditions before committing. Unique codes are only worth printing if someone verifies them against a maintained record. Budget for higher unit cost, longer lead times and a higher application reject rate. And write the one-page guide that tells people what a genuine label looks like, because an unchecked feature protects nothing.
