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 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 secure substrate may include a base layer and an opacity layer disposed above the base layer. An optional background layer may be disposed above the opacity layer. The secure substrate may further include an inkjet receptive layer. A first inkjet receptive layer may be disposed above the background layer, and a second inkjet layer may be disposed below the base layer. The opacity layer may include copper such as metallic copper flakes or other particles. The opacity layer may also include a binder material such as polyvinyl alcohol, and in some cases also carbon black, process black, or the like.

A secure substrate may include a base layer and an opacity layer disposed above the base layer. An optional background layer may be disposed above the opacity layer. The secure substrate may further include an inkjet receptive layer. A first inkjet receptive layer may be disposed above the background layer, and a second inkjet layer may be disposed below the base layer. The opacity layer may include copper such as metallic copper flakes or other particles. The opacity layer may also include a binder material such as polyvinyl alcohol, and in some cases also carbon black, process black, or the like.

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 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 with a removable SOC is provided that is compatible with process color digital imaging, method and system for producing the document enhances production, and expands the aesthetics of the documents.

A multi-game ticket assembly and associated method of making include a substrate having a front surface and a back surface. A first game play area is provided on the front surface and includes a plurality of game symbols for play of a first game. A second game play area is provided on the back surface and includes one or more windows defined therein for play of a second game partially embodied on the back surface. A fold line indication on the front surface and divides the substrate into a first portion and a second portion. The second portion is foldable onto the first portion in a folded state of the substrate such that the front surface of the second portion is against the front surface of the first portion and the one or more windows align with the first game play area. The game symbols in the first game play area that are visible to a player through the one or more windows in the folded state of the substrate determine an outcome of the second game.

A multi-game ticket assembly and associated method of making include a substrate having a front surface and a back surface. A first game play area is provided on the front surface and includes a plurality of game symbols for play of a first game. A second game play area is provided on the back surface and includes one or more windows defined therein for play of a second game partially embodied on the back surface. A fold line indication on the front surface and divides the substrate into a first portion and a second portion. The second portion is foldable onto the first portion in a folded state of the substrate such that the front surface of the second portion is against the front surface of the first portion and the one or more windows align with the first game play area. The game symbols in the first game play area that are visible to a player through the one or more windows in the folded state of the substrate determine an outcome of the second game.