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PREPARATION OF CONCEALED DETECTABLE INK IMAGES

IP.com Disclosure Number: IPCOM000026588D
Original Publication Date: 1992-Oct-31
Included in the Prior Art Database: 2004-Apr-06
Document File: 2 page(s) / 97K

Publishing Venue

Xerox Disclosure Journal

Abstract

A liquid ink composition suitable for ink jet printing comprising a liquid vehicle and a colorless fluorescent material is disclosed. The composition may be utilized to prepare concealed ink jet images, which are invisible to the naked eye under visible light, but are detectable under illumination with an ultraviolet light source. Printing concealed ink jet images is useful for document handling and identification, document authentication and recognition, such as barcodes and glyphs, and various security document applications, for example, bank notes, currencies, bonds, stock certificates, and confidential reports. Concealed images may be prepared on a paper or an equivalent substrate using an ink jet printer, for example, continuous and drop-on-demand types, and a liquid ink containing colorless fluorescent dye compounds and optional additives.

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XEROX DISCLOSURE JOURNAL

PREPARATION OF CONCEALED DETECTABLE INK IMAGES John Wei-Ping Lin

Proposed Classification
U.S. C1.364140 Int. C1. Gold 15/16

A liquid ink composition suitable for ink jet printing comprising a liquid vehicle and a colorless fluorescent material is disclosed. The composition may be utilized to prepare concealed ink jet images, which are invisible to the naked eye under visible light, but are detectable under illumination with an ultraviolet light source. Printing concealed ink jet images is useful for document handling and identification, document authentication and recognition, such as barcodes and glyphs, and various security document applications, for example, bank notes, currencies, bonds, stock certificates, and confidential reports. Concealed images may be prepared on a paper or an equivalent substrate using an ink jet printer, for example, continuous and drop-on-demand types, and a liquid ink containing colorless fluorescent dye compounds and optional additives.

The fluorescent material may be either water soluble or dispersible and it can be made into an ink jet ink along with other necessary ingredients, for example, humectants, biocide, polymeric additive, surfactant, dispersing agent, pH buffering agent, corrosion controlling agent, viscosity modifier, lubricant, water, and the like. The fluorescent material can emit light in the visible region provided the created image can be matched with the color of the imaging substrate to give concealed information under normal viewing conditions. It is imp...