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 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 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 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 printed game card, sheet or ticket set can incorporate multiple individual tickets separated by perforation, scoring or folds, for example. In various embodiments, the game card or sheet is printed with at least one playable game on each individual ticket, wherein the games can be instant win games with game indicia and one or more layers of varnish or rubber-based material that is removable to reveal the indicia. Each ticket on the game card, sheet or ticket set can include individual validation and/or activation indicia. The indicia can be human-readable and/or computer readable. Further, the entire game card, sheet or ticket set can include game or sheet activation indicia, such that when the entire sheet is sold, the entirety of individual game tickets can be activated simultaneously. When the individual game ticket validation codes are read, embodiments of the present invention can operate to individually assess whether the ticket is a winner, as well as whether the ticket has previously been redeemed.

A printed game card, sheet or ticket set can incorporate multiple individual tickets separated by perforation, scoring or folds, for example. In various embodiments, the game card or sheet is printed with at least one playable game on each individual ticket, wherein the games can be instant win games with game indicia and one or more layers of varnish or rubber-based material that is removable to reveal the indicia. Each ticket on the game card, sheet or ticket set can include individual validation and/or activation indicia. The indicia can be human-readable and/or computer readable. Further, the entire game card, sheet or ticket set can include game or sheet activation indicia, such that when the entire sheet is sold, the entirety of individual game tickets can be activated simultaneously. When the individual game ticket validation codes are read, embodiments of the present invention can operate to individually assess whether the ticket is a winner, as well as whether the ticket has previously been redeemed.

A removable scratch-off document with a display portion, printing method and system ensuring the integrity and security of the document with variable win and lose variable information protected by a scratch-off coating by overprinting at least one of at least a part of the scratch-off coating and at least a part of the display portion using stochastic imaging. The resulting printed document is more attractive and consistent over varying surfaces, as well as more secure against illicit attempt to remove the scratch-off coating by lift and float techniques.

A removable scratch-off document with a display portion, printing method and system ensuring the integrity and security of the document with variable win and lose variable information protected by a scratch-off coating by overprinting at least one of at least a part of the scratch-off coating and at least a part of the display portion using stochastic imaging. The resulting printed document is more attractive and consistent over varying surfaces, as well as more secure against illicit attempt to remove the scratch-off coating by lift and float techniques.

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%.