VersaInk Invisible Red Fluorescent Ink 1L Invisible fluorescent ink supports many general purpose and security applications Print discrete information delivery, watermarks, passports, ID, invisible barcode scanning on tickets, tags and labels, printing on textiles and applying to skin and paintings as invisible content for authentication and special effects VersaInk Invisible Fluorescent Inks can be printed or brush applied on media without interfering with other content on the same documents using regular visible ink and paint Enable authentication of objects and items using UV (ultraviolet 365nm) light VersaInk Invisible inks are available in fluorescent Blue (460nm), Red (615nm) & Green/Yellow (540nm) - compatible with digital inkjets for production & desktop printing using piezo & thermal print heads by HP, Lexmark, Canon, Epson, Brother and others.