Substrate fluorescence pattern mask for embedding information in printed documents

• Main Authors: Bala, Raja, Eschbach, Reiner
• Format: Patent
• Language: English
• Published: 09.10.2012

The teachings as provided herein relate to a watermark embedded in an image that has the property of being relatively indecipherable under normal light, and yet decipherable under UV light. This fluorescent mark comprises a substrate containing optical brightening agents, and a first colorant mixtur...