Disclosed herein is an electrostatic ink composition comprising a component selected from a fatty acid ester having a plurality of hydroxyl substituents and a fatty acid amide having a plurality of hydroxyl substituents. Also described herein are scratch-off structures and methods for producing them.

A printed security-enhanced document, printing method, and system for ensuring that any printing defects present in the variable indicia also occur in the background on the document protected. By ensuring that random printing defects in the variable indicia also appear in the same document's background, detection of the printing defects becomes more readily apparent.

A printed security-enhanced document, printing method, and system for ensuring that any printing defects present in the variable indicia also occur in the background on the document protected. By ensuring that random printing defects in the variable indicia also appear in the same document's background, detection of the printing defects becomes more readily apparent.

A redundantly printed security-enhanced document, printing method, and system for better ensuring that the meaning of the information imparted by variable indicia printed by redundant printing indicia on a document protected by a removable Scratch-Off Coating (SOC). By printing the variable indicia with multiple colors, redundancy and integrity of the intended indicia is achieved relative to the perception of human eye photoreceptor cones. The redundantly printed document, methods, and systems enhance the overall appearance of the redundantly printed document, and reduce possible consequences resulting from misprinted variable indicia.

A full-color protected document, and methods and systems for making same, secured by a removable Scratch-Off Coating, where the protection against document alteration and/or copy type attacks is provided by digitally imaging Benday patterns and/or digital imaged background patterns around the variable indicia. By printing Benday patterns and/or imaged background using the same process color imagers, usability and integrity of the protected document are achieved relative to the consumer's perspective while at the same time providing a more secure, less expensive, and more aesthetically pleasing document design.

A full-color protected document, and methods and systems for making same, secured by a removable Scratch-Off Coating, where the protection against document alteration and/or copy type attacks is provided by digitally imaging Benday patterns and/or digital imaged background patterns around the variable indicia. By printing Benday patterns and/or imaged background using the same process color imagers, usability and integrity of the protected document are achieved relative to the consumer's perspective while at the same time providing a more secure, less expensive, and more aesthetically pleasing document design.

A redundantly printed security-enhanced document, printing method and system ensure the meaning of the information imparted by variable indicia printed by redundant printing on the document with removable scratch-off coatings. By printing the variable indicia with multiple colors, redundancy and integrity of the intended indicia is achieved. Additionally, inverted color indicia countermeasures to pinprick attacks are also disclosed. The redundantly printed document, methods and systems enhance the overall appearance of the redundantly printed document, and reduce possible consequences resulting from misprinted variable indicia. The resultant printed process color indicia maintains a grayscale equivalent level of a process color greater than or equal to the measured grayscale equivalent level of the substrate surface plus an additional contrast delta of 15%.

A security-enhanced document includes a substrate and variable indicia comprising ink having a signal. The variable indicia is of a specific type and is applied to the substrate using a specific application technique. At least one other printed portion, which is a back of the document, has background ink noise, and the type of ink of the back of the document is of the same type of ink applied to the substrate using the same application technique as the ink of the variable indicia. The document also includes a scratch-off-coating applied over the variable indicia. The document has a signal-to-noise ratio of the ink of the variable indicia relative to the background ink noise of the back of the document that is not appreciable, thereby making the variable indicia unreadable with reference to the back of the document when the scratch-off-coating remains intact.

A security-enhanced document includes a substrate and variable indicia comprising ink having a signal. The variable indicia is of a specific type and is applied to the substrate using a specific application technique. At least one other printed portion, which is a back of the document, has background ink noise, and the type of ink of the back of the document is of the same type of ink applied to the substrate using the same application technique as the ink of the variable indicia. The document also includes a scratch-off-coating applied over the variable indicia. The document has a signal-to-noise ratio of the ink of the variable indicia relative to the background ink noise of the back of the document that is not appreciable, thereby making the variable indicia unreadable with reference to the back of the document when the scratch-off-coating remains intact.

A lottery ticket is printed on a substrate sheet material having a front surface with lottery game indicia printed thereon and a removable covering material, typically scratch-off material, covering the lottery game indicia which is removable by a player to expose the game indicia for playing the game and other game information printed on the substrate sheet material where at least part of the substrate sheet material is formed of a translucent synthetic material to enable viewing through the part by the player.