In a thermal transfer recording sheet including a base material and a colorant layer, the colorant layer includes a yellow dye layer containing a yellow dye, a magenta dye layer containing a magenta dye, and a cyan dye layer containing a cyan dye, and the cyan dye includes a compound represented by Formula (1a) or Formula (1b): ##STR00001##
where R.sub.1 to R.sub.7 are substituents, X.sup. is an anion, and the compound of Formula (1b) has at least one anionic substituent.

A color-forming composition is useful to provide a printout image in an imaged lithographic printing plate precursor. This color-forming composition includes (a) an acid generator; (b) a tetraaryl borate; (c) an acid-sensitive dye precursor; and (d) a compound having the following Structure (I):

##STR00001##

wherein n is 1, 2, 3, or 4; R independently represents a monovalent substituent or the atoms necessary to form a fused ring if n is at least 2, and at least one R substituent is an electron-withdrawing group. The color-forming composition is included within a negative-working radiation-sensitive imageable layer along with a free radically polymerizable component and a radiation absorber such as an infrared radiation absorber.

According to one embodiment, a recording medium is a recording medium in a card form. The recording medium includes a substrate, and a color development layer laminated on the substrate, and provided with a line for security that extends along a lamination surface of the substrate from an end face of the recording medium, such that presence or absence of the line for security is optically identifiable at the end face. It is thus provided a recording medium that can easily prevent falsification with a simple structure, and allows authenticity determination to be performed relatively easily.

Aspects of the invention include color change compositions having a color former and color developer composition that transitions from a first color state to a second color state upon application of an applied stimulus and an amount of a copolymer sufficient to eliminate background color of the color former and color developer composition during transition from the first color state to the second color state. Methods for preparing and devices employing the color change compositions of the invention are also described.

Aspects of the invention include color change compositions having a color former and color developer composition that transitions from a first color state to a second color state upon application of an applied stimulus and an amount of a copolymer sufficient to eliminate background color of the color former and color developer composition during transition from the first color state to the second color state. Methods for preparing and devices employing the color change compositions of the invention are also described.

A heat-sensitive recording material having i) a supporting substrate and ii) a heat-sensitive recording layer, where the heat-sensitive recording layer comprises a colour former and a colour developer mixture and the colour developer mixture comprises a) N-[2-(3-phenylureido)phenyl]benzenesulfonamide (compound of the formula (I)), where the compound of the formula (I) is in a crystalline form having an absorption band at 3401 20 cm 1 in the IR spectrum, and b) N-(4-methylphenylsulfonyl)-N-(3-(4-methylphenylsulfonyloxy)phenyl) urea (compound of the formula (II)), where the mass ratio between the compound of the formula (I) and the compound of the formula (II) is 0.5:99.5 to 35:65 or 99.5:0.5 to 65:35.

A heat-sensitive recording material having i) a supporting substrate and ii) a heat-sensitive recording layer, where the heat-sensitive recording layer comprises a colour former and a colour developer mixture and the colour developer mixture comprises a) N-[2-(3-phenylureido)phenyl]benzenesulfonamide (compound of the formula (I)), where the compound of the formula (I) is in a crystalline form having an absorption band at 3401 20 cm 1 in the IR spectrum, and b) N-(4-methylphenylsulfonyl)-N-(3-(4-methylphenylsulfonyloxy)phenyl) urea (compound of the formula (II)), where the mass ratio between the compound of the formula (I) and the compound of the formula (II) is 0.5:99.5 to 35:65 or 99.5:0.5 to 65:35.

A heat-sensitive recording material eempri waff-having i) a carrier substrate and ii) a heat-sensitive recording lavcrr-wheKH-fth*. The heat-sensitive recording layer contains a color former and a color developer mixture and the color developer mixture contains a) N-[2 -(3- phenylureido)phenyl]benzole sulfonamide (compound of formula (1)). wherein tlw. The compound of formula (I) is present in a crystalline form, which has an absorption band in the IR spectrum at 3401cm-1. and b) N-(4-methylphenylsulfonyl)-N-(3-(4- methylphenylsulfonyloxy)phenyl)urea (compound of formula (II)).

A heat-sensitive recording material eempri waff-having i) a carrier substrate and ii) a heat-sensitive recording lavcrr-wheKH-fth*. The heat-sensitive recording layer contains a color former and a color developer mixture and the color developer mixture contains a) N-[2 -(3- phenylureido)phenyl]benzole sulfonamide (compound of formula (1)). wherein tlw. The compound of formula (I) is present in a crystalline form, which has an absorption band in the IR spectrum at 3401cm-1. and b) N-(4-methylphenylsulfonyl)-N-(3-(4- methylphenylsulfonyloxy)phenyl)urea (compound of formula (II)).

Dual functionality recording media are disclosed. The recording media or materials can impart information both by direct thermal printing, and by being receptive to a modified inkjet printing technology known in the art as Memjet printing, which combines microelectromechanical systems (MEMS) and inkjet technology. The recording materials include a base substrate to which several coatings are applied. The coatings are selected to provide both direct thermal functionality and receptivity to Memjet-type dye-based inks as applied in Memjet-type printing systems. Heat-sensitive recording capability is provided by a leuco dye/acidic developer combination. Receptivity to Memjet-type dye-based printing is provided by a topcoat of suitable composition. The present inventors recognized that Memjet-type inks printed onto the topcoat suffer from a graying problem, but the problem is solved by appropriate selection of the leuco dye/acidic developer combination.