Glass watermarking technique can also be used on ceramics, metal
The new watermarking technology is expected to be used on the face of expensive Swiss watches and other brand name electronics. The watermark is invisible under regular light, but becomes readily apparent under ultraviolet light. The glass watermarking technique was developed at École Polytechnique Fédérale de Lausanne and can be used on glass, ceramics and metals.
The technique works using a process called vapor deposition, which applies the company’s patented chemical formulation onto the surface of the glass. Following deposition, the process uses lithographic printing to determine which areas of the coated glass will be activated under UV light. The lithographic printing can create an image that illuminates when struck by UV light. The watermark could consist of a logo, image, serial number, word or any other distinctive pattern. The result is known as a photonic watermark.
The technique is attractive to manufacturers of high-end goods because it doesn’t change the appearance of the finished product, and the watermark can be activated with an ordinary device. The devices uses to create the watermark are expensive, and the watermark itself relies on a patented concoction that counterfeiters are unlikely to have access to.
The deposited vapor, which serves as a basis for the watermarking technology is about 1/10,000th as thick as a human hair, so it is imperceptible under normal conditions. The process took about two years to develop, and some watchmakers have already expressed interest in incorporating watermarks into their products.
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Photo Credit: EPFL