Invisible to the eye until exposed to a specific light wavelength, revealing the ink by fluorescence.

Types of inks

• Ultraviolet light
• • Single wavelength
  • Dual wavelength
• Infrared light

They are used in all types of documents: negotiable documents, identity documents, public documents, and in brand protection.
A different case is double-wave fluorescent ink, which is used in high-security documents, especially public ones. This ink is considered high-security, as is IR-fluorescent ink.

Observations
A specific device is needed to verify this ink.

Security level
Medium