Invisible Security Marks and Their Usage in IoT


NAMI has developed novel color changing and fluorescent security marks for product authentication.

  • Invisible Security Marks and Their Usage in IoT 0
  • Invisible Security Marks and Their Usage in IoT 1
Commercialisation opportunities
Non-exclusive licensing
Problem addressed

Novel technologies are in need to combat ever-growing counterfeit consumer goods. Unlike commercial color changing materials that require UV light source to trigger, NAMI’s color changing materials can be easily triggered by visible light source such as flashlight on mobile phone.

  • By adopting novel ink formulation, inkjet-printed security marks like QR codes and smart tags being revealed by visible light source have been realized. By using a mobile device, the secret QR code is colorized and scannable. 
  • This technology can be used for IoT applications such as connection to webpages, cloud platform and real-time database.
  • NAMI has also developed a new class of luminescent ink showing different fluorescent colors upon irradiation by different kinds of light sources, offering a higher level anti-counterfeiting.
Key impact
  • Compatible with various substrates
  • Applicable with various printing methods
  • Excitable with UV-free light source, e.g. mobile flashlight
  • Meet international chemical safety standards
  • Silver Medal at the “2021 Geneva International Exhibition of Inventions”
  • Highly secret anti-counterfeit features
  • Rewritable paper
  • IoT product packaging
  • Interactive toys
Nano and Advanced Materials Institute (NAMI)

As a Materials Expert, Nano and Advanced Materials Institute (NAMI) has a strong portfolio of innovative technologies to support and collaborate with the industry, offering frontier-applied research on advanced materials as well as technology transfer for commercialization success.

NAMI, incorporated in 2006, is designated by the Innovation and Technology Commission of the Hong Kong Government as a Research and Development Center for nanotechnology and advanced materials. NAMI undertakes and provides support for market-driven research in nanotechnology and advanced materials, and strives for commercialization of the technologies to benefit the industry and the society at large, as well as re-industrialization to promote the economic growth and sustainability of Hong Kong.