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Dr. Elif Kaya

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April 28, 2026

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9 min read

What is a marker?

A marker is a physical element added to a product during the production stage that makes the product's authenticity verifiable afterwards. A good marker carries three properties at once: it can be read reliably, it is hard to imitate and it can be integrated without damaging the product. The balance of these three properties determines which marker technology is suitable for which product.

The marker is only half of the problem; the other half is the infrastructure that reads that marker and binds it to an identity.

Visible and invisible markers

The first distinction of markers is visibility. Visible markers — holograms, special inks, textured prints — are elements the consumer can notice with the naked eye. Their advantage is being intuitive; their disadvantage is that, being visible, they are also open to imitation.

Invisible markers appear only with a specific stimulus. A luminescence marker glows with light at a specific wavelength; a magnetic signature is seen only with a suitable reader. The strength of an invisible marker comes from the counterfeiter not knowing what they need to imitate.

The main marker families

Luminescence markers rely on compounds that give a predictable reaction under light. Magnetic markers place a measurable magnetic signature into the material. Edible — food-contact-safe — markers are designed for sensitive products such as food and medicine. Particle-based markers give every product a statistically unique pattern. Molecular and DNA-based markers, in turn, carry the identity to the smallest scale of the material.

No marker family is the 'best' on its own. The choice is made according to the product's material, production line, cost target and the nature of the threat. Most of the time, the most robust solution is using several marker layers together.

From marker to identity

A marker on its own is only a data point; what makes it meaningful is the identity it is bound to when read. When the marker is read, it points to a product record: which batch, which date, which market. This way a physical property turns into a traceable digital identity.

A product's unique identity is formed exactly at this point: in the union of an uncopyable physical marker and a data layer that places it in context. The marker is only half of the problem; the other half is the infrastructure that reads and verifies that marker.