Brilliant counterfeit protection

June 2, 2010
Beside counterfeit protection, the process is also suitable for an effective quality assurance: Here outlines characterize well-bonded and poorly bonded coatings on a function sheet. Such sheets are used to manufacture OLEDs. (© Armin Okulla/Harald Holeczek)

(PhysOrg.com) -- Counterfeit products create losses in the billions each year. Beside the economic damages, all too often additional risks arise from the poor materials and shoddy workmanship of "knock-off artists". Yet with the aid of fluorescing dyes, materials can be individually tagged and identified with certainty.

For quite some time now, product has been affecting more than just consumer goods, like watches and designer clothing. The producer industry also has to combat bogus and qualitatively inferior materials. Specialized security features, like watermarks, bar codes, RFID tags and holograms label the products, and thus safeguard them from falsification, theft and manipulation. So when it comes to security features: the more complicated it is to imitate a brand, the more secure the system.

A team of German researchers from four Fraunhofer Institutes recently engineered a brand new process that is particularly forgery-proof: "We add various fluorescing dyes to the entire material," explains Dr. Andreas Holländer of the Fraunhofer Institute for Applied Polymer Research IAP. "With the aid of the fluorescence, we can precisely ascertain specific characteristics, and thereby recognize if we are dealing with the original, and if the quality standards have been met."

Fluorescence can be found in certain organic dyes: Irradiate them within a certain wave length range, and they emit their own light with a greater wavelength. The type of luminosity - i.e., wavelength and light intensity - depends on the physical and chemical properties of the to which the dye was applied. Various dyes react to different properties, such as pH value or viscosity. For example, a certain dye glows in a tightly-interlaced resin more strongly than in one that is not as dense.

To make a product counterfeit-proof, the researchers therefore add multiple dyes to the material. "In this manner, an individualized marker emerges that is exceedingly difficult to imitate," says Holländer. Thanks to the slight dosing, it is virtually impossible to decode the type and quantity of the dye additives: just a few ppb (parts per billion) of dye concentrates suffice to mark the material. Another advantage: The counterfeit protection definitely cannot be removed. "Using conventional security features, the spot with the labeling can be eliminated from the material, theoretically speaking. But that approach doesn‘t work with our technology, since the dye permeates the entire material, and itself is a component of the identification label," says Holländer. Beside counterfeit protection, the process is also suitable for an effective quality assurance, such as with coatings: With the aid of various dyes, manufacturers can monitor the chemical composition, degree of dryness and the thickness of the coat during the production process.

The new technology has already passed the first practice tests: Researchers marked barrier sheets for organic light-emitting diodes (OLEDs) and photovoltaics with dyes a development from the Fraunhofer Polymer Surfaces Alliance POLO. The process is basically ready to be used - however, it still must be adapted to each material. A standard solution would also be contrary to the intention of the inventor: "One reason for the high degree of security of our technology is precisely because there are only material-specific solutions," reiterates Holländer.

Explore further: The Dye with the Pumpkin Cuff

Related Stories

The Dye with the Pumpkin Cuff

June 20, 2005

Complexation with a large cuff-shaped molecule stabilizes rhodamine dye fluorescence When irradiated, fluorescent dyes emit light at a different wavelength; for scientists and engineers, these dyes are extremely important ...

Nanoparticle Scattering Improves Laser Performance

June 4, 2009

(PhysOrg.com) -- “Light scattering” and “optical performance” are two concepts that usually head in opposite directions, but they have recently been shown to walk happily hand-in-hand. The results are impressive laser ...

'Holey' Nanosheets for Wastewater Dye Removal

July 1, 2009

(PhysOrg.com) -- Researchers have discovered that extremely thin sheets of nickel oxide with hexagonally shaped holes can absorb hazardous dyes from wastewater nearly as well as the best traditional methods, but are recyclable. ...

White glow: Dye-doped DNA nanofibers emit white light

July 8, 2009

(PhysOrg.com) -- Efficient energy transport plays an important role in the development of optoelectonic materials. The true masters of energy transfer via a hierarchical arrangement of different molecules are the photosynthetic ...

An easy way to see the world's thinnest material

December 23, 2009

It's been used to dye the Chicago River green on St. Patrick's Day. It's been used to find latent blood stains at crime scenes. And now researchers at Northwestern University have used it to examine the thinnest material ...

Recommended for you

Brazilian wasp venom kills cancer cells by opening them up

September 1, 2015

The social wasp Polybia paulista protects itself against predators by producing venom known to contain a powerful cancer-fighting ingredient. A Biophysical Journal study published September 1 reveals exactly how the venom's ...

Naturally-occurring protein enables slower-melting ice cream

August 31, 2015

(Phys.org)—Scientists have developed a slower-melting ice cream—consider the advantages the next time a hot summer day turns your child's cone with its dream-like mound of orange, vanilla and lemon swirls with chocolate ...

1 comment

Adjust slider to filter visible comments by rank

Display comments: newest first

gunslingor1
not rated yet Jun 02, 2010
It can be broken, gauranteed. Perhaps simply by buying the original, sheading lightwaves of different frequencies until the luminosity is obtained and matching the luminousity in the forgery. Gase spectroscopy could also discern the constituents.

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.