Covert security features which are invisible in normal light but fluoresce under UV verification.
Part Number: 02-83000-300 High-Quality TROY SecureUV Toner Cartridge for use with the TROY M451 and HP LaserJet M451 Printers only. Cartridge yields approx. 2,500 pages with 5% coverage. This cartridge will be used in place of the yellow cartridge (CE412A), and will fluoresce blue.